1851531872256 has 480 divisors, whose sum is σ = 6047116115040. Its totient is φ = 559772467200.

The previous prime is 1851531872219. The next prime is 1851531872257. The reversal of 1851531872256 is 6522781351581.

1851531872256 is a `hidden beast` number, since 1 + 8 + 5 + 1 + 5 + 318 + 72 + 256 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1851531872257) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1041941640 + ... + 1041943416.

It is an arithmetic number, because the mean of its divisors is an integer number (12598158573).

Almost surely, 2^{1851531872256} is an apocalyptic number.

1851531872256 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 1851531872256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3023558057520).

1851531872256 is an abundant number, since it is smaller than the sum of its proper divisors (4195584242784).

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

1851531872256 is a wasteful number, since it uses less digits than its factorization.

1851531872256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393 (or 2364 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 54.

The spelling of 1851531872256 in words is "one trillion, eight hundred fifty-one billion, five hundred thirty-one million, eight hundred seventy-two thousand, two hundred fifty-six".