257549049907 has 4 divisors (see below), whose sum is σ = 271104263080. Its totient is φ = 243993836736.

The previous prime is 257549049899. The next prime is 257549049941. The reversal of 257549049907 is 709940945752.

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 257549049907 - 2³ = 257549049899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257549049997) 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, 6777606558 + ... + 6777606595.

It is an arithmetic number, because the mean of its divisors is an integer number (67776065770).

Almost surely, 2^257549049907 is an apocalyptic number.

257549049907 is a deficient number, since it is larger than the sum of its proper divisors (13555213173).

257549049907 is a wasteful number, since it uses less digits than its factorization.

257549049907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13555213172.

The product of its (nonzero) digits is 28576800, while the sum is 61.

The spelling of 257549049907 in words is "two hundred fifty-seven billion, five hundred forty-nine million, forty-nine thousand, nine hundred seven".