251552564543 has 32 divisors (see below), whose sum is σ = 310764585600. Its totient is φ = 202833469440.

The previous prime is 251552564533. The next prime is 251552564579. The reversal of 251552564543 is 345465255152.

It is not a de Polignac number, because 251552564543 - 2¹² = 251552560447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251552564503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13291055 + ... + 13309967.

It is an arithmetic number, because the mean of its divisors is an integer number (9711393300).

Almost surely, 2^251552564543 is an apocalyptic number.

251552564543 is a deficient number, since it is larger than the sum of its proper divisors (59212021057).

251552564543 is a wasteful number, since it uses less digits than its factorization.

251552564543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21232 (or 21218 counting only the distinct ones).

The product of its digits is 3600000, while the sum is 47.

The spelling of 251552564543 in words is "two hundred fifty-one billion, five hundred fifty-two million, five hundred sixty-four thousand, five hundred forty-three".