1851525881856 has 1344 divisors, whose sum is σ = 7066132070400. Its totient is φ = 454230540288.

The previous prime is 1851525881851. The next prime is 1851525881899. The reversal of 1851525881856 is 6581885251581.

1851525881856 is a `hidden beast` number, since 1 + 8 + 51 + 525 + 8 + 8 + 1 + 8 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 1851525881793 and 1851525881802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851525881851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4834271041 + ... + 4834271423.

Almost surely, 2^{1851525881856} is an apocalyptic number.

1851525881856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851525881856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3533066035200).

1851525881856 is an abundant number, since it is smaller than the sum of its proper divisors (5214606188544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1851525881856 is a wasteful number, since it uses less digits than its factorization.

1851525881856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 460 counting only the distinct ones).

The product of its digits is 30720000, while the sum is 63.

The spelling of 1851525881856 in words is "one trillion, eight hundred fifty-one billion, five hundred twenty-five million, eight hundred eighty-one thousand, eight hundred fifty-six".