251661241776 has 40 divisors (see below), whose sum is σ = 742999857664. Its totient is φ = 71903211840.

The previous prime is 251661241753. The next prime is 251661241841. The reversal of 251661241776 is 677142166152.

251661241776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251661241776² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374495560 + ... + 374496231.

Almost surely, 2^251661241776 is an apocalyptic number.

It is an amenable number.

251661241776 is an abundant number, since it is smaller than the sum of its proper divisors (491338615888).

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

251661241776 is a wasteful number, since it uses less digits than its factorization.

251661241776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748991809 (or 748991803 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The spelling of 251661241776 in words is "two hundred fifty-one billion, six hundred sixty-one million, two hundred forty-one thousand, seven hundred seventy-six".