257705803172 has 6 divisors (see below), whose sum is σ = 450985155558. Its totient is φ = 128852901584.

The previous prime is 257705803163. The next prime is 257705803189. The reversal of 257705803172 is 271308507752.

It can be written as a sum of positive squares in only one way, i.e., 138305147236 + 119400655936 = 371894^2 + 345544^2 .

It is a super-3 number, since 3×257705803172³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32213225393 + ... + 32213225400.

It is an arithmetic number, because the mean of its divisors is an integer number (75164192593).

Almost surely, 2^257705803172 is an apocalyptic number.

It is an amenable number.

257705803172 is a deficient number, since it is larger than the sum of its proper divisors (193279352386).

257705803172 is a wasteful number, since it uses less digits than its factorization.

257705803172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64426450797 (or 64426450795 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 47.

The spelling of 257705803172 in words is "two hundred fifty-seven billion, seven hundred five million, eight hundred three thousand, one hundred seventy-two".