256734727444455 has 64 divisors (see below), whose sum is σ = 442577339352960. Its totient is φ = 126334308096000.

The previous prime is 256734727444439. The next prime is 256734727444457. The reversal of 256734727444455 is 554444727437652.

It is not a de Polignac number, because 256734727444455 - 2⁴ = 256734727444439 is a prime.

It is a super-2 number, since 2×256734727444455² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256734727444455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256734727444457) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3999636501 + ... + 3999700689.

It is an arithmetic number, because the mean of its divisors is an integer number (6915270927390).

Almost surely, 2^{256734727444455} is an apocalyptic number.

256734727444455 is a deficient number, since it is larger than the sum of its proper divisors (185842611908505).

256734727444455 is a wasteful number, since it uses less digits than its factorization.

256734727444455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73332.

The product of its digits is 3161088000, while the sum is 69.

The spelling of 256734727444455 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, seven hundred twenty-seven million, four hundred forty-four thousand, four hundred fifty-five".