667724122207 has 4 divisors (see below), whose sum is σ = 702867497080. Its totient is φ = 632580747336.

The previous prime is 667724122111. The next prime is 667724122213. The reversal of 667724122207 is 702221427766.

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

It is not a de Polignac number, because 667724122207 - 2²³ = 667715733599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667724122907) 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, 17571687408 + ... + 17571687445.

It is an arithmetic number, because the mean of its divisors is an integer number (175716874270).

Almost surely, 2^667724122207 is an apocalyptic number.

667724122207 is a deficient number, since it is larger than the sum of its proper divisors (35143374873).

667724122207 is a wasteful number, since it uses less digits than its factorization.

667724122207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35143374872.

The product of its (nonzero) digits is 790272, while the sum is 46.

The spelling of 667724122207 in words is "six hundred sixty-seven billion, seven hundred twenty-four million, one hundred twenty-two thousand, two hundred seven".