251616230551 has 16 divisors (see below), whose sum is σ = 289897861120. Its totient is φ = 213921583200.

The previous prime is 251616230549. The next prime is 251616230627. The reversal of 251616230551 is 155032616152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 251616230551 - 2¹ = 251616230549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251616230551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251616230251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 938701 + ... + 1176601.

It is an arithmetic number, because the mean of its divisors is an integer number (18118616320).

Almost surely, 2^251616230551 is an apocalyptic number.

251616230551 is a deficient number, since it is larger than the sum of its proper divisors (38281630569).

251616230551 is a wasteful number, since it uses less digits than its factorization.

251616230551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239134.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 251616230551 in words is "two hundred fifty-one billion, six hundred sixteen million, two hundred thirty thousand, five hundred fifty-one".