666727605 has 48 divisors (see below), whose sum is σ = 1230937344. Its totient is φ = 345954240.

The previous prime is 666727601. The next prime is 666727619. The reversal of 666727605 is 506727666.

It is not a de Polignac number, because 666727605 - 2² = 666727601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666727601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37540 + ... + 52370.

It is an arithmetic number, because the mean of its divisors is an integer number (25644528).

Almost surely, 2^666727605 is an apocalyptic number.

It is an amenable number.

666727605 is a deficient number, since it is larger than the sum of its proper divisors (564209739).

666727605 is a wasteful number, since it uses less digits than its factorization.

666727605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14888 (or 14876 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 666727605 is about 25821.0690135014. The cubic root of 666727605 is about 873.6070811941.

The spelling of 666727605 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, six hundred five".