256910687798838 has 64 divisors (see below), whose sum is σ = 532352189399040. Its totient is φ = 82569357511200.

The previous prime is 256910687798797. The next prime is 256910687798839. The reversal of 256910687798838 is 838897786019652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256910687798839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53117653 + ... + 57752111.

It is an arithmetic number, because the mean of its divisors is an integer number (8318002959360).

Almost surely, 2^{256910687798838} is an apocalyptic number.

256910687798838 is an abundant number, since it is smaller than the sum of its proper divisors (275441501600202).

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

256910687798838 is a wasteful number, since it uses less digits than its factorization.

256910687798838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4635593.

The product of its (nonzero) digits is 17557585920, while the sum is 87.

The spelling of 256910687798838 in words is "two hundred fifty-six trillion, nine hundred ten billion, six hundred eighty-seven million, seven hundred ninety-eight thousand, eight hundred thirty-eight".