667036391 has 8 divisors (see below), whose sum is σ = 762486144. Its totient is φ = 571626360.

The previous prime is 667036379. The next prime is 667036427. The reversal of 667036391 is 193630766.

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 667036391 - 2¹⁸ = 666774247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667036351) 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, 50996 + ... + 62726.

It is an arithmetic number, because the mean of its divisors is an integer number (95310768).

Almost surely, 2^667036391 is an apocalyptic number.

667036391 is a deficient number, since it is larger than the sum of its proper divisors (95449753).

667036391 is a wasteful number, since it uses less digits than its factorization.

667036391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19861.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 667036391 is about 25827.0476632541. The cubic root of 667036391 is about 873.7419268692.

The spelling of 667036391 in words is "six hundred sixty-seven million, thirty-six thousand, three hundred ninety-one".