257340617591 has 4 divisors (see below), whose sum is σ = 257891668632. Its totient is φ = 256789566552.

The previous prime is 257340617587. The next prime is 257340617617. The reversal of 257340617591 is 195716043752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257340617591 - 2² = 257340617587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257340617531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275524820 + ... + 275525753.

It is an arithmetic number, because the mean of its divisors is an integer number (64472917158).

Almost surely, 2^257340617591 is an apocalyptic number.

257340617591 is a deficient number, since it is larger than the sum of its proper divisors (551051041).

257340617591 is an equidigital number, since it uses as much as digits as its factorization.

257340617591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551051040.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 257340617591 in words is "two hundred fifty-seven billion, three hundred forty million, six hundred seventeen thousand, five hundred ninety-one".