667579091 has 4 divisors (see below), whose sum is σ = 667845384. Its totient is φ = 667312800.

The previous prime is 667579067. The next prime is 667579109. The reversal of 667579091 is 190975766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190975766 = 2 ⋅95487883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667579091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667579021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129350 + ... + 134411.

It is an arithmetic number, because the mean of its divisors is an integer number (166961346).

Almost surely, 2^667579091 is an apocalyptic number.

667579091 is a deficient number, since it is larger than the sum of its proper divisors (266293).

667579091 is a wasteful number, since it uses less digits than its factorization.

667579091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266292.

The product of its (nonzero) digits is 714420, while the sum is 50.

The square root of 667579091 is about 25837.5519544712. The cubic root of 667579091 is about 873.9788210931.

The spelling of 667579091 in words is "six hundred sixty-seven million, five hundred seventy-nine thousand, ninety-one".