257057337561 has 4 divisors (see below), whose sum is σ = 342743116752. Its totient is φ = 171371558372.

The previous prime is 257057337557. The next prime is 257057337613. The reversal of 257057337561 is 165733750752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257057337561 - 2² = 257057337557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257057330561) 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, 42842889591 + ... + 42842889596.

It is an arithmetic number, because the mean of its divisors is an integer number (85685779188).

Almost surely, 2^257057337561 is an apocalyptic number.

It is an amenable number.

257057337561 is a deficient number, since it is larger than the sum of its proper divisors (85685779191).

257057337561 is an equidigital number, since it uses as much as digits as its factorization.

257057337561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85685779190.

The product of its (nonzero) digits is 4630500, while the sum is 51.

The spelling of 257057337561 in words is "two hundred fifty-seven billion, fifty-seven million, three hundred thirty-seven thousand, five hundred sixty-one".