667511017473247 has 4 divisors (see below), whose sum is σ = 667512627205320. Its totient is φ = 667509407741176.

The previous prime is 667511017473233. The next prime is 667511017473259. The reversal of 667511017473247 is 742374710115766.

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-667511017473247 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 (667511017573247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804243868 + ... + 805073425.

It is an arithmetic number, because the mean of its divisors is an integer number (166878156801330).

Almost surely, 2^{667511017473247} is an apocalyptic number.

667511017473247 is a deficient number, since it is larger than the sum of its proper divisors (1609732073).

667511017473247 is a wasteful number, since it uses less digits than its factorization.

667511017473247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609732072.

The product of its (nonzero) digits is 41489280, while the sum is 61.

The spelling of 667511017473247 in words is "six hundred sixty-seven trillion, five hundred eleven billion, seventeen million, four hundred seventy-three thousand, two hundred forty-seven".