667191701 has 8 divisors (see below), whose sum is σ = 733862208. Its totient is φ = 606536700.

The previous prime is 667191689. The next prime is 667191713. The reversal of 667191701 is 107191766.

It is an interprime number because it is at equal distance from previous prime (667191689) and next prime (667191713).

It is not a de Polignac number, because 667191701 - 2¹⁰ = 667190677 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 (667191731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249305 + ... + 251966.

It is an arithmetic number, because the mean of its divisors is an integer number (91732776).

Almost surely, 2^667191701 is an apocalyptic number.

It is an amenable number.

667191701 is a deficient number, since it is larger than the sum of its proper divisors (66670507).

667191701 is an equidigital number, since it uses as much as digits as its factorization.

667191701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501304 (or 501282 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 667191701 is about 25830.0542198424. The cubic root of 667191701 is about 873.8097344281.

The spelling of 667191701 in words is "six hundred sixty-seven million, one hundred ninety-one thousand, seven hundred one".