256733454007542 has 64 divisors (see below), whose sum is σ = 531545008608000. Its totient is φ = 82568956998528.

The previous prime is 256733454007531. The next prime is 256733454007553. The reversal of 256733454007542 is 245700454337652.

It is an interprime number because it is at equal distance from previous prime (256733454007531) and next prime (256733454007553).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1608636684 + ... + 1608796272.

It is an arithmetic number, because the mean of its divisors is an integer number (8305390759500).

Almost surely, 2^{256733454007542} is an apocalyptic number.

256733454007542 is an abundant number, since it is smaller than the sum of its proper divisors (274811554600458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256733454007542 is a wasteful number, since it uses less digits than its factorization.

256733454007542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166045.

The product of its (nonzero) digits is 84672000, while the sum is 57.

The spelling of 256733454007542 in words is "two hundred fifty-six trillion, seven hundred thirty-three billion, four hundred fifty-four million, seven thousand, five hundred forty-two".