667706854057 has 16 divisors (see below), whose sum is σ = 714822912000. Its totient is φ = 621789984144.

The previous prime is 667706854021. The next prime is 667706854123. The reversal of 667706854057 is 750458607766.

It is a cyclic number.

It is not a de Polignac number, because 667706854057 - 2¹⁹ = 667706329769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667706853986 and 667706854004.

It is not an unprimeable number, because it can be changed into a prime (667706854757) 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, 20653968 + ... + 20686270.

It is an arithmetic number, because the mean of its divisors is an integer number (44676432000).

Almost surely, 2^667706854057 is an apocalyptic number.

It is an amenable number.

667706854057 is a deficient number, since it is larger than the sum of its proper divisors (47116057943).

667706854057 is a wasteful number, since it uses less digits than its factorization.

667706854057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50820.

The product of its (nonzero) digits is 59270400, while the sum is 61.

The spelling of 667706854057 in words is "six hundred sixty-seven billion, seven hundred six million, eight hundred fifty-four thousand, fifty-seven".