656939945470 has 16 divisors (see below), whose sum is σ = 1183226854320. Its totient is φ = 262612655424.

The previous prime is 656939945449. The next prime is 656939945479. The reversal of 656939945470 is 74549939656.

It is a junction number, because it is equal to n+sod(n) for n = 656939945396 and 656939945405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656939945479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20398452 + ... + 20430631.

It is an arithmetic number, because the mean of its divisors is an integer number (73951678395).

Almost surely, 2^656939945470 is an apocalyptic number.

656939945470 is a deficient number, since it is larger than the sum of its proper divisors (526286908850).

656939945470 is a wasteful number, since it uses less digits than its factorization.

656939945470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40830699.

The product of its (nonzero) digits is 220449600, while the sum is 67.

The spelling of 656939945470 in words is "six hundred fifty-six billion, nine hundred thirty-nine million, nine hundred forty-five thousand, four hundred seventy".