257256652751 has 8 divisors (see below), whose sum is σ = 309481687680. Its totient is φ = 208900138968.

The previous prime is 257256652747. The next prime is 257256652753. The reversal of 257256652751 is 157256652752.

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 257256652751 - 2² = 257256652747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257256652693 and 257256652702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257256652753) 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, 967130141 + ... + 967130406.

It is an arithmetic number, because the mean of its divisors is an integer number (38685210960).

Almost surely, 2^257256652751 is an apocalyptic number.

257256652751 is a deficient number, since it is larger than the sum of its proper divisors (52225034929).

257256652751 is a wasteful number, since it uses less digits than its factorization.

257256652751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934260573.

The product of its digits is 8820000, while the sum is 53.

Subtracting from 257256652751 its reverse (157256652752), we obtain a palindrome (99999999999).

The spelling of 257256652751 in words is "two hundred fifty-seven billion, two hundred fifty-six million, six hundred fifty-two thousand, seven hundred fifty-one".