651420664220 has 48 divisors (see below), whose sum is σ = 1371393985248. Its totient is φ = 259918913280.

The previous prime is 651420664177. The next prime is 651420664241. The reversal of 651420664220 is 22466024156.

651420664220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 66595730 + ... + 66605510.

It is an arithmetic number, because the mean of its divisors is an integer number (28570708026).

Almost surely, 2^651420664220 is an apocalyptic number.

It is an amenable number.

651420664220 is an abundant number, since it is smaller than the sum of its proper divisors (719973321028).

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

651420664220 is a wasteful number, since it uses less digits than its factorization.

651420664220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17750 (or 17748 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 651420664220 its reverse (22466024156), we get a palindrome (673886688376).

The spelling of 651420664220 in words is "six hundred fifty-one billion, four hundred twenty million, six hundred sixty-four thousand, two hundred twenty".