256680451 has 6 divisors (see below), whose sum is σ = 258154652. Its totient is φ = 255214620.

The previous prime is 256680439. The next prime is 256680461. The reversal of 256680451 is 154086652.

It is not a de Polignac number, because 256680451 - 2⁵ = 256680419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256680451.

It is not an unprimeable number, because it can be changed into a prime (256680461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28036 + ... + 36046.

Almost surely, 2^256680451 is an apocalyptic number.

256680451 is the 8011-st decagonal number.

256680451 is a deficient number, since it is larger than the sum of its proper divisors (1474201).

256680451 is an frugal number, since it uses more digits than its factorization.

256680451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8369 (or 8190 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 256680451 is about 16021.2499824452. The cubic root of 256680451 is about 635.5225004894.

The spelling of 256680451 in words is "two hundred fifty-six million, six hundred eighty thousand, four hundred fifty-one".