257651612436 has 12 divisors (see below), whose sum is σ = 601187095712. Its totient is φ = 85883870808.

The previous prime is 257651612423. The next prime is 257651612489. The reversal of 257651612436 is 634216156752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10735483840 + ... + 10735483863.

Almost surely, 2^257651612436 is an apocalyptic number.

It is an amenable number.

257651612436 is an abundant number, since it is smaller than the sum of its proper divisors (343535483276).

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

257651612436 is a wasteful number, since it uses less digits than its factorization.

257651612436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21470967710 (or 21470967708 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 48.

The spelling of 257651612436 in words is "two hundred fifty-seven billion, six hundred fifty-one million, six hundred twelve thousand, four hundred thirty-six".