256612377621 has 8 divisors (see below), whose sum is σ = 345471680320. Its totient is φ = 169413996672.

The previous prime is 256612377617. The next prime is 256612377649. The reversal of 256612377621 is 126773216652.

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

It is not a de Polignac number, because 256612377621 - 2² = 256612377617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256612377611) 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, 415230076 + ... + 415230693.

It is an arithmetic number, because the mean of its divisors is an integer number (43183960040).

Almost surely, 2^256612377621 is an apocalyptic number.

It is an amenable number.

256612377621 is a deficient number, since it is larger than the sum of its proper divisors (88859302699).

256612377621 is a wasteful number, since it uses less digits than its factorization.

256612377621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830460875.

The product of its digits is 1270080, while the sum is 48.

The spelling of 256612377621 in words is "two hundred fifty-six billion, six hundred twelve million, three hundred seventy-seven thousand, six hundred twenty-one".