666426365 has 8 divisors (see below), whose sum is σ = 872412768. Its totient is φ = 484673680.

The previous prime is 666426347. The next prime is 666426391. The reversal of 666426365 is 563624666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666426365 - 2¹⁰ = 666425341 is a prime.

It is a super-2 number, since 2×666426365² = 888248199934226450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6058367 + ... + 6058476.

It is an arithmetic number, because the mean of its divisors is an integer number (109051596).

Almost surely, 2^666426365 is an apocalyptic number.

It is an amenable number.

666426365 is a deficient number, since it is larger than the sum of its proper divisors (205986403).

666426365 is a wasteful number, since it uses less digits than its factorization.

666426365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12116859.

The product of its digits is 933120, while the sum is 44.

The square root of 666426365 is about 25815.2351335408. The cubic root of 666426365 is about 873.4754907017.

The spelling of 666426365 in words is "six hundred sixty-six million, four hundred twenty-six thousand, three hundred sixty-five".