668292005 has 16 divisors (see below), whose sum is σ = 832782384. Its totient is φ = 514437120.

The previous prime is 668291993. The next prime is 668292043. The reversal of 668292005 is 500292866.

It can be written as a sum of positive squares in 8 ways, for example, as 61999876 + 606292129 = 7874^2 + 24623^2 .

It is not a de Polignac number, because 668292005 - 2⁴ = 668291989 is a prime.

It is a super-2 number, since 2×668292005² = 893228407893840050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668292005.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7364 + ... + 37293.

It is an arithmetic number, because the mean of its divisors is an integer number (52048899).

Almost surely, 2^668292005 is an apocalyptic number.

It is an amenable number.

668292005 is a deficient number, since it is larger than the sum of its proper divisors (164490379).

668292005 is a wasteful number, since it uses less digits than its factorization.

668292005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44776.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 668292005 is about 25851.3443557584. The cubic root of 668292005 is about 874.2898204850.

The spelling of 668292005 in words is "six hundred sixty-eight million, two hundred ninety-two thousand, five".