667799517 has 64 divisors (see below), whose sum is σ = 1185546240. Its totient is φ = 323870400.

The previous prime is 667799497. The next prime is 667799521. The reversal of 667799517 is 715997766.

It is not a de Polignac number, because 667799517 - 2⁸ = 667799261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667799527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 310548 + ... + 312690.

It is an arithmetic number, because the mean of its divisors is an integer number (18524160).

Almost surely, 2^667799517 is an apocalyptic number.

It is an amenable number.

667799517 is a deficient number, since it is larger than the sum of its proper divisors (517746723).

667799517 is a wasteful number, since it uses less digits than its factorization.

667799517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254.

The product of its digits is 5000940, while the sum is 57.

The square root of 667799517 is about 25841.8172155133. The cubic root of 667799517 is about 874.0750026836.

The spelling of 667799517 in words is "six hundred sixty-seven million, seven hundred ninety-nine thousand, five hundred seventeen".