667257472817 has 32 divisors (see below), whose sum is σ = 769405486080. Its totient is φ = 573960764160.

The previous prime is 667257472813. The next prime is 667257472831. The reversal of 667257472817 is 718274752766.

667257472817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667257472817 - 2² = 667257472813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667257472817.

It is not an unprimeable number, because it can be changed into a prime (667257472813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4282718 + ... + 4435784.

It is an arithmetic number, because the mean of its divisors is an integer number (24043921440).

Almost surely, 2^667257472817 is an apocalyptic number.

It is an amenable number.

667257472817 is a deficient number, since it is larger than the sum of its proper divisors (102148013263).

667257472817 is a wasteful number, since it uses less digits than its factorization.

667257472817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153513.

The product of its digits is 55319040, while the sum is 62.

The spelling of 667257472817 in words is "six hundred sixty-seven billion, two hundred fifty-seven million, four hundred seventy-two thousand, eight hundred seventeen".