660860479 has 4 divisors (see below), whose sum is σ = 661258584. Its totient is φ = 660462376.

The previous prime is 660860477. The next prime is 660860491. The reversal of 660860479 is 974068066.

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 660860479 - 2¹ = 660860477 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 (660860471) 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, 196552 + ... + 199885.

It is an arithmetic number, because the mean of its divisors is an integer number (165314646).

Almost surely, 2^660860479 is an apocalyptic number.

660860479 is a deficient number, since it is larger than the sum of its proper divisors (398105).

660860479 is a wasteful number, since it uses less digits than its factorization.

660860479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398104.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 660860479 is about 25707.2067521931. The cubic root of 660860479 is about 871.0369803489.

The spelling of 660860479 in words is "six hundred sixty million, eight hundred sixty thousand, four hundred seventy-nine".