257340617638 has 16 divisors (see below), whose sum is σ = 433778165856.
Its totient is φ = 113608566720.
The previous prime is 257340617617. The next prime is 257340617641. The reversal of 257340617638 is 836716043752.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215167143 + ... + 215168338.
It is an arithmetic number, because the mean of its divisors is an integer number (27111135366).
Almost surely, 2257340617638 is an apocalyptic number.
257340617638 is a deficient number, since it is larger than the sum of its proper divisors (176437548218).
257340617638 is a wasteful number, since it uses less digits than its factorization.
257340617638 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 430335519.
The product of its (nonzero) digits is 5080320, while the sum is 52.
The spelling of 257340617638 in words is "two hundred fifty-seven billion, three hundred forty million, six hundred seventeen thousand, six hundred thirty-eight".