656053254355221 has 32 divisors (see below), whose sum is σ = 1005451183296000. Its totient is φ = 422284807473984.

The previous prime is 656053254355211. The next prime is 656053254355237. The reversal of 656053254355221 is 122553452350656.

656053254355221 is a `hidden beast` number, since 6 + 5 + 6 + 0 + 5 + 3 + 25 + 43 + 552 + 21 = 666.

It is not a de Polignac number, because 656053254355221 - 2¹⁴ = 656053254338837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656053254355211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144712516 + ... + 149177138.

It is an arithmetic number, because the mean of its divisors is an integer number (31420349478000).

Almost surely, 2^{656053254355221} is an apocalyptic number.

It is an amenable number.

656053254355221 is a deficient number, since it is larger than the sum of its proper divisors (349397928940779).

656053254355221 is a wasteful number, since it uses less digits than its factorization.

656053254355221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4652330 (or 4652324 counting only the distinct ones).

The product of its (nonzero) digits is 32400000, while the sum is 54.

The spelling of 656053254355221 in words is "six hundred fifty-six trillion, fifty-three billion, two hundred fifty-four million, three hundred fifty-five thousand, two hundred twenty-one".