1861373152800 has 864 divisors, whose sum is σ = 8291793666240. Its totient is φ = 400425984000.

The previous prime is 1861373152787. The next prime is 1861373152823. The reversal of 1861373152800 is 82513731681.

It is a happy number.

1861373152800 is a `hidden beast` number, since 1 + 8 + 61 + 37 + 31 + 528 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a super-2 number, since 2×1861373152800² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 17941075 + ... + 18044525.

It is an arithmetic number, because the mean of its divisors is an integer number (9596983410).

Almost surely, 2^{1861373152800} is an apocalyptic number.

1861373152800 is a gapful number since it is divisible by the number (10) 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 1861373152800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4145896833120).

1861373152800 is an abundant number, since it is smaller than the sum of its proper divisors (6430420513440).

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

1861373152800 is a wasteful number, since it uses less digits than its factorization.

1861373152800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103511 (or 103485 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 1861373152800 in words is "one trillion, eight hundred sixty-one billion, three hundred seventy-three million, one hundred fifty-two thousand, eight hundred".