257245753636 has 27 divisors (see below), whose sum is σ = 452064276027. Its totient is φ = 128086772760.

The previous prime is 257245753631. The next prime is 257245753691. The reversal of 257245753636 is 636357542752.

The square root of 257245753636 is 507194.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257245753631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 372280051 + ... + 372280741.

Almost surely, 2^257245753636 is an apocalyptic number.

257245753636 is the 507194-th square number.

It is an amenable number.

257245753636 is a deficient number, since it is larger than the sum of its proper divisors (194818522391).

257245753636 is an frugal number, since it uses more digits than its factorization.

257245753636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 1060 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 55.

The spelling of 257245753636 in words is "two hundred fifty-seven billion, two hundred forty-five million, seven hundred fifty-three thousand, six hundred thirty-six".