668081001 has 32 divisors (see below), whose sum is σ = 1035569920. Its totient is φ = 375238656.

The previous prime is 668080999. The next prime is 668081003. The reversal of 668081001 is 100180866.

It is an interprime number because it is at equal distance from previous prime (668080999) and next prime (668081003).

It is not a de Polignac number, because 668081001 - 2¹ = 668080999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668081001.

It is not an unprimeable number, because it can be changed into a prime (668081003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 318765 + ... + 320853.

It is an arithmetic number, because the mean of its divisors is an integer number (32361560).

Almost surely, 2^668081001 is an apocalyptic number.

It is an amenable number.

668081001 is a deficient number, since it is larger than the sum of its proper divisors (367488919).

668081001 is a wasteful number, since it uses less digits than its factorization.

668081001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 668081001 is about 25847.2629305310. The cubic root of 668081001 is about 874.1977958077.

The spelling of 668081001 in words is "six hundred sixty-eight million, eighty-one thousand, one".