257567298421 has 8 divisors (see below), whose sum is σ = 261293486040. Its totient is φ = 253859603712.

The previous prime is 257567298407. The next prime is 257567298427. The reversal of 257567298421 is 124892765752.

It can be written as a sum of positive squares in 4 ways, for example, as 6195421521 + 251371876900 = 78711^2 + 501370^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 257567298421 - 2⁹ = 257567297909 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 (257567298427) 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, 4595170 + ... + 4650883.

It is an arithmetic number, because the mean of its divisors is an integer number (32661685755).

Almost surely, 2^257567298421 is an apocalyptic number.

It is an amenable number.

257567298421 is a deficient number, since it is larger than the sum of its proper divisors (3726187619).

257567298421 is an equidigital number, since it uses as much as digits as its factorization.

257567298421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9246455.

The product of its digits is 16934400, while the sum is 58.

The spelling of 257567298421 in words is "two hundred fifty-seven billion, five hundred sixty-seven million, two hundred ninety-eight thousand, four hundred twenty-one".