666606431 has 8 divisors (see below), whose sum is σ = 742967280. Its totient is φ = 594373248.

The previous prime is 666606427. The next prime is 666606443. The reversal of 666606431 is 134606666.

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

It is a cyclic number.

It is not a de Polignac number, because 666606431 - 2² = 666606427 is a prime.

It is a super-2 number, since 2×666606431² = 888728267701115522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666606931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031576 + ... + 1032221.

It is an arithmetic number, because the mean of its divisors is an integer number (92870910).

Almost surely, 2^666606431 is an apocalyptic number.

666606431 is a deficient number, since it is larger than the sum of its proper divisors (76360849).

666606431 is a wasteful number, since it uses less digits than its factorization.

666606431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063833.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 666606431 is about 25818.7224896973. The cubic root of 666606431 is about 873.5541535930.

The spelling of 666606431 in words is "six hundred sixty-six million, six hundred six thousand, four hundred thirty-one".