651616839420 has 24 divisors (see below), whose sum is σ = 1824527150544. Its totient is φ = 173764490496.

The previous prime is 651616839397. The next prime is 651616839437. The reversal of 651616839420 is 24938616156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5430140269 + ... + 5430140388.

It is an arithmetic number, because the mean of its divisors is an integer number (76021964606).

Almost surely, 2^651616839420 is an apocalyptic number.

651616839420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651616839420 is an abundant number, since it is smaller than the sum of its proper divisors (1172910311124).

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

651616839420 is a wasteful number, since it uses less digits than its factorization.

651616839420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10860280669 (or 10860280667 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 651616839420 in words is "six hundred fifty-one billion, six hundred sixteen million, eight hundred thirty-nine thousand, four hundred twenty".