251120115540 has 120 divisors (see below), whose sum is σ = 900312158592. Its totient is φ = 57398880960.

The previous prime is 251120115527. The next prime is 251120115569. The reversal of 251120115540 is 45511021152.

It is a happy number.

251120115540 is a `hidden beast` number, since 2 + 5 + 1 + 1 + 2 + 0 + 115 + 540 = 666.

It is a super-2 number, since 2×251120115540² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11060976 + ... + 11083655.

Almost surely, 2^251120115540 is an apocalyptic number.

251120115540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251120115540 is an abundant number, since it is smaller than the sum of its proper divisors (649192043052).

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

251120115540 is a wasteful number, since it uses less digits than its factorization.

251120115540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22144659 (or 22144648 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 251120115540 its reverse (45511021152), we get a palindrome (296631136692).

The spelling of 251120115540 in words is "two hundred fifty-one billion, one hundred twenty million, one hundred fifteen thousand, five hundred forty".