421354660656 has 20 divisors (see below), whose sum is σ = 1088499540152. Its totient is φ = 140451553536.

The previous prime is 421354660651. The next prime is 421354660723. The reversal of 421354660656 is 656066453124.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 8778222097 = 421354660656 / (4 + 2 + 1 + 3 + 5 + 4 + 6 + 6 + 0 + 6 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (421354660651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4389111001 + ... + 4389111096.

Almost surely, 2^421354660656 is an apocalyptic number.

It is an amenable number.

421354660656 is an abundant number, since it is smaller than the sum of its proper divisors (667144879496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421354660656 is a wasteful number, since it uses less digits than its factorization.

421354660656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8778222108 (or 8778222102 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 421354660656 in words is "four hundred twenty-one billion, three hundred fifty-four million, six hundred sixty thousand, six hundred fifty-six".