256742712756742 has 16 divisors (see below), whose sum is σ = 405383637740400. Its totient is φ = 121614847079040.

The previous prime is 256742712756737. The next prime is 256742712756773. The reversal of 256742712756742 is 247657217247652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43291642 + ... + 48863602.

It is an arithmetic number, because the mean of its divisors is an integer number (25336477358775).

Almost surely, 2^{256742712756742} is an apocalyptic number.

256742712756742 is a deficient number, since it is larger than the sum of its proper divisors (148640924983658).

256742712756742 is a wasteful number, since it uses less digits than its factorization.

256742712756742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6784551.

The product of its digits is 553190400, while the sum is 67.

The spelling of 256742712756742 in words is "two hundred fifty-six trillion, seven hundred forty-two billion, seven hundred twelve million, seven hundred fifty-six thousand, seven hundred forty-two".