257757800051 has 4 divisors (see below), whose sum is σ = 264044575704. Its totient is φ = 251471024400.

The previous prime is 257757800021. The next prime is 257757800063. The reversal of 257757800051 is 150008757752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257757800051 - 2¹⁸ = 257757537907 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 257757799969 and 257757800005.

It is not an unprimeable number, because it can be changed into a prime (257757800021) 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, 3143387765 + ... + 3143387846.

It is an arithmetic number, because the mean of its divisors is an integer number (66011143926).

Almost surely, 2^257757800051 is an apocalyptic number.

257757800051 is a deficient number, since it is larger than the sum of its proper divisors (6286775653).

257757800051 is an equidigital number, since it uses as much as digits as its factorization.

257757800051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6286775652.

The product of its (nonzero) digits is 686000, while the sum is 47.

The spelling of 257757800051 in words is "two hundred fifty-seven billion, seven hundred fifty-seven million, eight hundred thousand, fifty-one".