667139709457 has 16 divisors (see below), whose sum is σ = 764970272640. Its totient is φ = 576358486272.

The previous prime is 667139709433. The next prime is 667139709469. The reversal of 667139709457 is 754907931766.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667139709457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667139709487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8392653 + ... + 8471770.

It is an arithmetic number, because the mean of its divisors is an integer number (47810642040).

Almost surely, 2^667139709457 is an apocalyptic number.

It is an amenable number.

667139709457 is a deficient number, since it is larger than the sum of its proper divisors (97830563183).

667139709457 is a wasteful number, since it uses less digits than its factorization.

667139709457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16864632.

The product of its (nonzero) digits is 60011280, while the sum is 64.

The spelling of 667139709457 in words is "six hundred sixty-seven billion, one hundred thirty-nine million, seven hundred nine thousand, four hundred fifty-seven".