660231679 has 4 divisors (see below), whose sum is σ = 660640600. Its totient is φ = 659822760.

The previous prime is 660231631. The next prime is 660231683. The reversal of 660231679 is 976132066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660231679 - 2¹⁵ = 660198911 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 (660231619) 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, 202029 + ... + 205270.

It is an arithmetic number, because the mean of its divisors is an integer number (165160150).

Almost surely, 2^660231679 is an apocalyptic number.

660231679 is a deficient number, since it is larger than the sum of its proper divisors (408921).

660231679 is a wasteful number, since it uses less digits than its factorization.

660231679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408920.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 660231679 is about 25694.9738081205. The cubic root of 660231679 is about 870.7606326301.

The spelling of 660231679 in words is "six hundred sixty million, two hundred thirty-one thousand, six hundred seventy-nine".