668009601 has 36 divisors (see below), whose sum is σ = 1148573712. Its totient is φ = 372831984.

The previous prime is 668009593. The next prime is 668009603. The reversal of 668009601 is 106900866.

It is not a de Polignac number, because 668009601 - 2³ = 668009593 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (668009603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1350 + ... + 36576.

Almost surely, 2^668009601 is an apocalyptic number.

It is an amenable number.

668009601 is a deficient number, since it is larger than the sum of its proper divisors (480564111).

668009601 is a wasteful number, since it uses less digits than its factorization.

668009601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35290 (or 35280 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 668009601 is about 25845.8817028942. The cubic root of 668009601 is about 874.1666519064.

The spelling of 668009601 in words is "six hundred sixty-eight million, nine thousand, six hundred one".