668429315 has 16 divisors (see below), whose sum is σ = 813286656. Its totient is φ = 527340000.

The previous prime is 668429257. The next prime is 668429317. The reversal of 668429315 is 513924866.

It is a Cunningham number, because it is equal to 25854²-1.

It is not a de Polignac number, because 668429315 - 2²⁶ = 601320451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668429317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126680 + ... + 131850.

It is an arithmetic number, because the mean of its divisors is an integer number (50830416).

Almost surely, 2^668429315 is an apocalyptic number.

668429315 is a deficient number, since it is larger than the sum of its proper divisors (144857341).

668429315 is a wasteful number, since it uses less digits than its factorization.

668429315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530.

The product of its digits is 311040, while the sum is 44.

The square root of 668429315 is about 25853.9999806606. Note that the first 4 decimals coincide. The cubic root of 668429315 is about 874.3496947682.

The spelling of 668429315 in words is "six hundred sixty-eight million, four hundred twenty-nine thousand, three hundred fifteen".