667139709456 has 160 divisors (see below), whose sum is σ = 2118447267840. Its totient is φ = 199316073600.

The previous prime is 667139709433. The next prime is 667139709469. The reversal of 667139709456 is 654907931766.

It is a junction number, because it is equal to n+sod(n) for n = 667139709393 and 667139709402.

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, 651280 + ... + 1326063.

It is an arithmetic number, because the mean of its divisors is an integer number (13240295424).

Almost surely, 2^667139709456 is an apocalyptic number.

667139709456 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

667139709456 is an abundant number, since it is smaller than the sum of its proper divisors (1451307558384).

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

667139709456 is a wasteful number, since it uses less digits than its factorization.

667139709456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977442 (or 1977430 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 63.

The spelling of 667139709456 in words is "six hundred sixty-seven billion, one hundred thirty-nine million, seven hundred nine thousand, four hundred fifty-six".