656466361440 has 192 divisors, whose sum is σ = 2260138567680. Its totient is φ = 159445278720.

The previous prime is 656466361393. The next prime is 656466361501. The reversal of 656466361440 is 44163664656.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1044610 + ... + 1550529.

It is an arithmetic number, because the mean of its divisors is an integer number (11771555040).

Almost surely, 2^656466361440 is an apocalyptic number.

656466361440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656466361440 is an abundant number, since it is smaller than the sum of its proper divisors (1603672206240).

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

656466361440 is a wasteful number, since it uses less digits than its factorization.

656466361440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595205 (or 2595197 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 51.

The spelling of 656466361440 in words is "six hundred fifty-six billion, four hundred sixty-six million, three hundred sixty-one thousand, four hundred forty".