251687258868 has 24 divisors (see below), whose sum is σ = 587342583072. Its totient is φ = 83885422624.

The previous prime is 251687258863. The next prime is 251687258887. The reversal of 251687258868 is 868852786152.

It is a junction number, because it is equal to n+sod(n) for n = 251687258799 and 251687258808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251687258861) 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, 1189455 + ... + 1384982.

It is an arithmetic number, because the mean of its divisors is an integer number (24472607628).

Almost surely, 2^251687258868 is an apocalyptic number.

It is an amenable number.

251687258868 is an abundant number, since it is smaller than the sum of its proper divisors (335655324204).

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

251687258868 is a wasteful number, since it uses less digits than its factorization.

251687258868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582591 (or 2582589 counting only the distinct ones).

The product of its digits is 103219200, while the sum is 66.

It can be divided in two parts, 251687 and 258868, that added together give a triangular number (510555 = T₁₀₁₀).

The spelling of 251687258868 in words is "two hundred fifty-one billion, six hundred eighty-seven million, two hundred fifty-eight thousand, eight hundred sixty-eight".