257642692013 has 4 divisors (see below), whose sum is σ = 294448790880. Its totient is φ = 220836593148.

The previous prime is 257642691991. The next prime is 257642692067. The reversal of 257642692013 is 310296246752.

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 257642692013 - 2²⁴ = 257625914797 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 (257642698013) 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, 18403049423 + ... + 18403049436.

It is an arithmetic number, because the mean of its divisors is an integer number (73612197720).

Almost surely, 2^257642692013 is an apocalyptic number.

It is an amenable number.

257642692013 is a deficient number, since it is larger than the sum of its proper divisors (36806098867).

257642692013 is an equidigital number, since it uses as much as digits as its factorization.

257642692013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36806098866.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 257642692013 in words is "two hundred fifty-seven billion, six hundred forty-two million, six hundred ninety-two thousand, thirteen".