660547979 has 24 divisors (see below), whose sum is σ = 835774128. Its totient is φ = 517406400.

The previous prime is 660547963. The next prime is 660548023. The reversal of 660547979 is 979745066.

It is not a de Polignac number, because 660547979 - 2⁴ = 660547963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660547979.

It is not an unprimeable number, because it can be changed into a prime (660547079) 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 23 ways as a sum of consecutive naturals, for example, 59204 + ... + 69470.

It is an arithmetic number, because the mean of its divisors is an integer number (34823922).

Almost surely, 2^660547979 is an apocalyptic number.

660547979 is a deficient number, since it is larger than the sum of its proper divisors (175226149).

660547979 is a wasteful number, since it uses less digits than its factorization.

660547979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10395 (or 10388 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 53.

The square root of 660547979 is about 25701.1279713557. The cubic root of 660547979 is about 870.8996634310.

The spelling of 660547979 in words is "six hundred sixty million, five hundred forty-seven thousand, nine hundred seventy-nine".