667376791 has 8 divisors (see below), whose sum is σ = 675251424. Its totient is φ = 659527200.

The previous prime is 667376779. The next prime is 667376819. The reversal of 667376791 is 197673766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667376791 - 2²⁵ = 633822359 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 (667376771) 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, 50326 + ... + 62188.

It is an arithmetic number, because the mean of its divisors is an integer number (84406428).

Almost surely, 2^667376791 is an apocalyptic number.

667376791 is a deficient number, since it is larger than the sum of its proper divisors (7874633).

667376791 is a wasteful number, since it uses less digits than its factorization.

667376791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12521.

The product of its digits is 2000376, while the sum is 52.

The square root of 667376791 is about 25833.6368132712. The cubic root of 667376791 is about 873.8905300425.

The spelling of 667376791 in words is "six hundred sixty-seven million, three hundred seventy-six thousand, seven hundred ninety-one".