257064988987 has 8 divisors (see below), whose sum is σ = 257942141072. Its totient is φ = 256188096000.

The previous prime is 257064988909. The next prime is 257064988993. The reversal of 257064988987 is 789889460752.

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 257064988987 - 2²³ = 257056600379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257064988787) 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, 2038987 + ... + 2161387.

It is an arithmetic number, because the mean of its divisors is an integer number (32242767634).

Almost surely, 2^257064988987 is an apocalyptic number.

257064988987 is a deficient number, since it is larger than the sum of its proper divisors (877152085).

257064988987 is a wasteful number, since it uses less digits than its factorization.

257064988987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129549.

The product of its (nonzero) digits is 487710720, while the sum is 73.

The spelling of 257064988987 in words is "two hundred fifty-seven billion, sixty-four million, nine hundred eighty-eight thousand, nine hundred eighty-seven".