256742406670 has 24 divisors (see below), whose sum is σ = 490919915304. Its totient is φ = 96655963776.

The previous prime is 256742406667. The next prime is 256742406671. The reversal of 256742406670 is 76604247652.

256742406670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256742406671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44416212 + ... + 44421991.

It is an arithmetic number, because the mean of its divisors is an integer number (20454996471).

Almost surely, 2^256742406670 is an apocalyptic number.

256742406670 is a deficient number, since it is larger than the sum of its proper divisors (234177508634).

256742406670 is a wasteful number, since it uses less digits than its factorization.

256742406670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88838244 (or 88838227 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 49.

The spelling of 256742406670 in words is "two hundred fifty-six billion, seven hundred forty-two million, four hundred six thousand, six hundred seventy".