251562656532 has 24 divisors (see below), whose sum is σ = 640341307872. Its totient is φ = 76231108000.

The previous prime is 251562656507. The next prime is 251562656557. The reversal of 251562656532 is 235656265152.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (251562656507) and next prime (251562656557).

It is a super-2 number, since 2×251562656532² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952888719 + ... + 952888982.

It is an arithmetic number, because the mean of its divisors is an integer number (26680887828).

Almost surely, 2^251562656532 is an apocalyptic number.

251562656532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

251562656532 is an abundant number, since it is smaller than the sum of its proper divisors (388778651340).

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

251562656532 is a wasteful number, since it uses less digits than its factorization.

251562656532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905777719 (or 1905777717 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 48.

The spelling of 251562656532 in words is "two hundred fifty-one billion, five hundred sixty-two million, six hundred fifty-six thousand, five hundred thirty-two".