660479279 has 2 divisors, whose sum is σ = 660479280. Its totient is φ = 660479278.

The previous prime is 660479251. The next prime is 660479333. The reversal of 660479279 is 972974066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660479279 - 2¹² = 660475183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660479779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330239639 + 330239640.

It is an arithmetic number, because the mean of its divisors is an integer number (330239640).

Almost surely, 2^660479279 is an apocalyptic number.

660479279 is a deficient number, since it is larger than the sum of its proper divisors (1).

660479279 is an equidigital number, since it uses as much as digits as its factorization.

660479279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 660479279 is about 25699.7914193870. The cubic root of 660479279 is about 870.8694698729.

The spelling of 660479279 in words is "six hundred sixty million, four hundred seventy-nine thousand, two hundred seventy-nine".