667402057079 has 4 divisors (see below), whose sum is σ = 679994548776. Its totient is φ = 654809565384.

The previous prime is 667402057067. The next prime is 667402057093. The reversal of 667402057079 is 970750204766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667402057079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 12592491643 = 667402057079 / (6 + 6 + 7 + 4 + 0 + 2 + 0 + 5 + 7 + 0 + 7 + 9).

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 667402057079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667402057279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6296245769 + ... + 6296245874.

It is an arithmetic number, because the mean of its divisors is an integer number (169998637194).

Almost surely, 2^667402057079 is an apocalyptic number.

667402057079 is a deficient number, since it is larger than the sum of its proper divisors (12592491697).

667402057079 is a wasteful number, since it uses less digits than its factorization.

667402057079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12592491696.

The product of its (nonzero) digits is 4445280, while the sum is 53.

The spelling of 667402057079 in words is "six hundred sixty-seven billion, four hundred two million, fifty-seven thousand, seventy-nine".