251552564542 has 4 divisors (see below), whose sum is σ = 377328846816. Its totient is φ = 125776282270.

The previous prime is 251552564533. The next prime is 251552564579. The reversal of 251552564542 is 245465255152.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 251552564492 and 251552564501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62888141134 + ... + 62888141137.

It is an arithmetic number, because the mean of its divisors is an integer number (94332211704).

Almost surely, 2^251552564542 is an apocalyptic number.

251552564542 is a deficient number, since it is larger than the sum of its proper divisors (125776282274).

251552564542 is a wasteful number, since it uses less digits than its factorization.

251552564542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125776282273.

The product of its digits is 2400000, while the sum is 46.

The spelling of 251552564542 in words is "two hundred fifty-one billion, five hundred fifty-two million, five hundred sixty-four thousand, five hundred forty-two".