251045342156 has 36 divisors (see below), whose sum is σ = 533362785648. Its totient is φ = 101261983488.

The previous prime is 251045342131. The next prime is 251045342203. The reversal of 251045342156 is 651243540152.

It is a super-2 number, since 2×251045342156² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15503855 + ... + 15520038.

Almost surely, 2^251045342156 is an apocalyptic number.

It is an amenable number.

251045342156 is an abundant number, since it is smaller than the sum of its proper divisors (282317443492).

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

251045342156 is a wasteful number, since it uses less digits than its factorization.

251045342156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31023938 (or 31023919 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 251045342156 in words is "two hundred fifty-one billion, forty-five million, three hundred forty-two thousand, one hundred fifty-six".