257081070078 has 32 divisors (see below), whose sum is σ = 652904305920. Its totient is φ = 73451734200.

The previous prime is 257081070053. The next prime is 257081070089. The reversal of 257081070078 is 870070180752.

257081070078 is a `hidden beast` number, since 2 + 570 + 8 + 1 + 0 + 7 + 0 + 0 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340053948 + ... + 340054703.

It is an arithmetic number, because the mean of its divisors is an integer number (20403259560).

Almost surely, 2^257081070078 is an apocalyptic number.

257081070078 is an abundant number, since it is smaller than the sum of its proper divisors (395823235842).

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

257081070078 is a wasteful number, since it uses less digits than its factorization.

257081070078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680108669 (or 680108663 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 45.

The spelling of 257081070078 in words is "two hundred fifty-seven billion, eighty-one million, seventy thousand, seventy-eight".