646064550420 has 48 divisors (see below), whose sum is σ = 1809035121600. Its totient is φ = 172278701056.

The previous prime is 646064550379. The next prime is 646064550457. The reversal of 646064550420 is 24055460646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2115556 + ... + 2401604.

It is an arithmetic number, because the mean of its divisors is an integer number (37688231700).

Almost surely, 2^646064550420 is an apocalyptic number.

646064550420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646064550420 is an abundant number, since it is smaller than the sum of its proper divisors (1162970571180).

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

646064550420 is a wasteful number, since it uses less digits than its factorization.

646064550420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323704 (or 323702 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 646064550420 in words is "six hundred forty-six billion, sixty-four million, five hundred fifty thousand, four hundred twenty".