256993338475 has 6 divisors (see below), whose sum is σ = 318671739740. Its totient is φ = 205594670760.

The previous prime is 256993338473. The next prime is 256993338479. The reversal of 256993338475 is 574833399652.

It is not a de Polignac number, because 256993338475 - 2¹ = 256993338473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256993338473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5139866745 + ... + 5139866794.

Almost surely, 2^256993338475 is an apocalyptic number.

256993338475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256993338475 is a deficient number, since it is larger than the sum of its proper divisors (61678401265).

256993338475 is a wasteful number, since it uses less digits than its factorization.

256993338475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10279733549 (or 10279733544 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 64.

The spelling of 256993338475 in words is "two hundred fifty-six billion, nine hundred ninety-three million, three hundred thirty-eight thousand, four hundred seventy-five".