256683909926742 has 16 divisors (see below), whose sum is σ = 513367999962480. Its totient is φ = 85561273290752.

The previous prime is 256683909926729. The next prime is 256683909926771. The reversal of 256683909926742 is 247629909386652.

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, 17359318 + ... + 28543190.

It is an arithmetic number, because the mean of its divisors is an integer number (32085499997655).

Almost surely, 2^{256683909926742} is an apocalyptic number.

256683909926742 is an abundant number, since it is smaller than the sum of its proper divisors (256684090035738).

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

256683909926742 is a wasteful number, since it uses less digits than its factorization.

256683909926742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15009087.

The product of its (nonzero) digits is 4232632320, while the sum is 78.

The spelling of 256683909926742 in words is "two hundred fifty-six trillion, six hundred eighty-three billion, nine hundred nine million, nine hundred twenty-six thousand, seven hundred forty-two".