257215880265 has 8 divisors (see below), whose sum is σ = 411545408448. Its totient is φ = 137181802800.

The previous prime is 257215880261. The next prime is 257215880323. The reversal of 257215880265 is 562088512752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257215880265 - 2² = 257215880261 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (257215880261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8573862661 + ... + 8573862690.

It is an arithmetic number, because the mean of its divisors is an integer number (51443176056).

Almost surely, 2^257215880265 is an apocalyptic number.

It is an amenable number.

257215880265 is a deficient number, since it is larger than the sum of its proper divisors (154329528183).

257215880265 is a wasteful number, since it uses less digits than its factorization.

257215880265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17147725359.

The product of its (nonzero) digits is 2688000, while the sum is 51.

The spelling of 257215880265 in words is "two hundred fifty-seven billion, two hundred fifteen million, eight hundred eighty thousand, two hundred sixty-five".