668454081 has 16 divisors (see below), whose sum is σ = 901152000. Its totient is φ = 440722688.

The previous prime is 668454053. The next prime is 668454107. The reversal of 668454081 is 180454866.

It is a cyclic number.

It is not a de Polignac number, because 668454081 - 2²⁹ = 131583169 is a prime.

It is a super-2 number, since 2×668454081² = 893661716811109122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668454481) by changing a digit.

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, 103705 + ... + 109961.

It is an arithmetic number, because the mean of its divisors is an integer number (56322000).

Almost surely, 2^668454081 is an apocalyptic number.

It is an amenable number.

668454081 is a deficient number, since it is larger than the sum of its proper divisors (232697919).

668454081 is a wasteful number, since it uses less digits than its factorization.

668454081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6648.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 668454081 is about 25854.4789349931. The cubic root of 668454081 is about 874.3604931561.

The spelling of 668454081 in words is "six hundred sixty-eight million, four hundred fifty-four thousand, eighty-one".