666727604 has 6 divisors (see below), whose sum is σ = 1166773314. Its totient is φ = 333363800.

The previous prime is 666727601. The next prime is 666727619. The reversal of 666727604 is 406727666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 658025104 + 8702500 = 25652^2 + 2950^2 .

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 polite number, since it can be written as a sum of consecutive naturals, namely, 83340947 + ... + 83340954.

It is an arithmetic number, because the mean of its divisors is an integer number (194462219).

Almost surely, 2^666727604 is an apocalyptic number.

It is an amenable number.

666727604 is a deficient number, since it is larger than the sum of its proper divisors (500045710).

666727604 is a wasteful number, since it uses less digits than its factorization.

666727604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166681905 (or 166681903 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 666727604 is about 25821.0689941373. The cubic root of 666727604 is about 873.6070807573.

The spelling of 666727604 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, six hundred four".