256742707467566 has 32 divisors (see below), whose sum is σ = 395617506747840. Its totient is φ = 124871874932736.

The previous prime is 256742707467509. The next prime is 256742707467607. The reversal of 256742707467566 is 665764707247652.

It is a Harshad number since it is a multiple of its sum of digits (74).

It is a junction number, because it is equal to n+sod(n) for n = 256742707467493 and 256742707467502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10516626776 + ... + 10516651188.

It is an arithmetic number, because the mean of its divisors is an integer number (12363047085870).

Almost surely, 2^{256742707467566} is an apocalyptic number.

256742707467566 is a deficient number, since it is larger than the sum of its proper divisors (138874799280274).

256742707467566 is a wasteful number, since it uses less digits than its factorization.

256742707467566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52748.

The product of its (nonzero) digits is 4978713600, while the sum is 74.

The spelling of 256742707467566 in words is "two hundred fifty-six trillion, seven hundred forty-two billion, seven hundred seven million, four hundred sixty-seven thousand, five hundred sixty-six".