256477701027421 has 8 divisors (see below), whose sum is σ = 264763285507584. Its totient is φ = 248192873438160.

The previous prime is 256477701027419. The next prime is 256477701027437. The reversal of 256477701027421 is 124720107774652.

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

It is a cyclic number.

It is not a de Polignac number, because 256477701027421 - 2¹ = 256477701027419 is a prime.

It is a super-2 number, since 2×256477701027421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256477701024421) 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, 188534026 + ... + 189889531.

It is an arithmetic number, because the mean of its divisors is an integer number (33095410688448).

Almost surely, 2^{256477701027421} is an apocalyptic number.

It is an amenable number.

256477701027421 is a deficient number, since it is larger than the sum of its proper divisors (8285584480163).

256477701027421 is a wasteful number, since it uses less digits than its factorization.

256477701027421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378445451.

The product of its (nonzero) digits is 9219840, while the sum is 55.

The spelling of 256477701027421 in words is "two hundred fifty-six trillion, four hundred seventy-seven billion, seven hundred one million, twenty-seven thousand, four hundred twenty-one".