257686047016 has 8 divisors (see below), whose sum is σ = 483161338170. Its totient is φ = 128843023504.

The previous prime is 257686046951. The next prime is 257686047077. The reversal of 257686047016 is 610740686752.

It can be written as a sum of positive squares in only one way, i.e., 221944632100 + 35741414916 = 471110^2 + 189054^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16105377931 + ... + 16105377946.

Almost surely, 2^257686047016 is an apocalyptic number.

It is an amenable number.

257686047016 is a deficient number, since it is larger than the sum of its proper divisors (225475291154).

257686047016 is a wasteful number, since it uses less digits than its factorization.

257686047016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32210755883 (or 32210755879 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 257686047016 in words is "two hundred fifty-seven billion, six hundred eighty-six million, forty-seven thousand, sixteen".