256620422451 has 8 divisors (see below), whose sum is σ = 342167634640. Its totient is φ = 171076745952.

The previous prime is 256620422449. The next prime is 256620422459. The reversal of 256620422451 is 154224026652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256620422451 - 2¹ = 256620422449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256620422459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709660 + ... + 1008393.

It is an arithmetic number, because the mean of its divisors is an integer number (42770954330).

Almost surely, 2^256620422451 is an apocalyptic number.

256620422451 is a deficient number, since it is larger than the sum of its proper divisors (85547212189).

256620422451 is a wasteful number, since it uses less digits than its factorization.

256620422451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767845.

The product of its (nonzero) digits is 230400, while the sum is 39.

The spelling of 256620422451 in words is "two hundred fifty-six billion, six hundred twenty million, four hundred twenty-two thousand, four hundred fifty-one".