257747640188 has 6 divisors (see below), whose sum is σ = 451058370336. Its totient is φ = 128873820092.

The previous prime is 257747640173. The next prime is 257747640223. The reversal of 257747640188 is 881046747752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32218455020 + ... + 32218455027.

It is an arithmetic number, because the mean of its divisors is an integer number (75176395056).

Almost surely, 2^257747640188 is an apocalyptic number.

It is an amenable number.

257747640188 is a deficient number, since it is larger than the sum of its proper divisors (193310730148).

257747640188 is a wasteful number, since it uses less digits than its factorization.

257747640188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64436910051 (or 64436910049 counting only the distinct ones).

The product of its (nonzero) digits is 21073920, while the sum is 59.

The spelling of 257747640188 in words is "two hundred fifty-seven billion, seven hundred forty-seven million, six hundred forty thousand, one hundred eighty-eight".