257164847999 has 4 divisors (see below), whose sum is σ = 257482728720. Its totient is φ = 256846967280.

The previous prime is 257164847993. The next prime is 257164848037. The reversal of 257164847999 is 999748461752.

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 257164847999 - 2¹⁶ = 257164782463 is a prime.

It is a super-2 number, since 2×257164847999² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257164847993) 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, 158939147 + ... + 158940764.

It is an arithmetic number, because the mean of its divisors is an integer number (64370682180).

Almost surely, 2^257164847999 is an apocalyptic number.

257164847999 is a deficient number, since it is larger than the sum of its proper divisors (317880721).

257164847999 is an equidigital number, since it uses as much as digits as its factorization.

257164847999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317880720.

The product of its digits is 274337280, while the sum is 71.

The spelling of 257164847999 in words is "two hundred fifty-seven billion, one hundred sixty-four million, eight hundred forty-seven thousand, nine hundred ninety-nine".