667149599 has 4 divisors (see below), whose sum is σ = 670013136. Its totient is φ = 664286064.

The previous prime is 667149589. The next prime is 667149629. The reversal of 667149599 is 995941766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 995941766 = 2 ⋅497970883.

It is a cyclic number.

It is not a de Polignac number, because 667149599 - 2²⁸ = 398714143 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 (667149589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431419 + ... + 1431884.

It is an arithmetic number, because the mean of its divisors is an integer number (167503284).

Almost surely, 2^667149599 is an apocalyptic number.

667149599 is a deficient number, since it is larger than the sum of its proper divisors (2863537).

667149599 is a wasteful number, since it uses less digits than its factorization.

667149599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863536.

The product of its digits is 3674160, while the sum is 56.

The square root of 667149599 is about 25829.2392261174. The cubic root of 667149599 is about 873.7913539480.

The spelling of 667149599 in words is "six hundred sixty-seven million, one hundred forty-nine thousand, five hundred ninety-nine".