251601653116 has 24 divisors (see below), whose sum is σ = 480976965504. Its totient is φ = 114210450480.

The previous prime is 251601653113. The next prime is 251601653143. The reversal of 251601653116 is 611356106152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251601653113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3815370 + ... + 3880753.

It is an arithmetic number, because the mean of its divisors is an integer number (20040706896).

Almost surely, 2^251601653116 is an apocalyptic number.

It is an amenable number.

251601653116 is a deficient number, since it is larger than the sum of its proper divisors (229375312388).

251601653116 is a wasteful number, since it uses less digits than its factorization.

251601653116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7696881 (or 7696879 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

Adding to 251601653116 its reverse (611356106152), we get a palindrome (862957759268).

The spelling of 251601653116 in words is "two hundred fifty-one billion, six hundred one million, six hundred fifty-three thousand, one hundred sixteen".