1551551234256 has 80 divisors (see below), whose sum is σ = 4454838086400. Its totient is φ = 517031453952.

The previous prime is 1551551234227. The next prime is 1551551234257. The reversal of 1551551234256 is 6524321551551.

1551551234256 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 551 + 2 + 3 + 42 + 56 = 666.

It is a super-2 number, since 2×1551551234256² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551551234257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944740 + ... + 1998908.

It is an arithmetic number, because the mean of its divisors is an integer number (55685476080).

Almost surely, 2^{1551551234256} is an apocalyptic number.

1551551234256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1551551234256 is an abundant number, since it is smaller than the sum of its proper divisors (2903286852144).

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

1551551234256 is a wasteful number, since it uses less digits than its factorization.

1551551234256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057593 (or 1057581 counting only the distinct ones).

The product of its digits is 900000, while the sum is 45.

The spelling of 1551551234256 in words is "one trillion, five hundred fifty-one billion, five hundred fifty-one million, two hundred thirty-four thousand, two hundred fifty-six".