257068977521 has 4 divisors (see below), whose sum is σ = 257141456112. Its totient is φ = 256996498932.

The previous prime is 257068977421. The next prime is 257068977527. The reversal of 257068977521 is 125779860752.

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 a de Polignac number, because none of the positive numbers 2^k-257068977521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257068977527) 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, 36233975 + ... + 36241068.

It is an arithmetic number, because the mean of its divisors is an integer number (64285364028).

Almost surely, 2^257068977521 is an apocalyptic number.

It is an amenable number.

257068977521 is a deficient number, since it is larger than the sum of its proper divisors (72478591).

257068977521 is an equidigital number, since it uses as much as digits as its factorization.

257068977521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72478590.

The product of its (nonzero) digits is 14817600, while the sum is 59.

The spelling of 257068977521 in words is "two hundred fifty-seven billion, sixty-eight million, nine hundred seventy-seven thousand, five hundred twenty-one".