666065560 has 16 divisors (see below), whose sum is σ = 1498647600. Its totient is φ = 266426208.

The previous prime is 666065551. The next prime is 666065563. The reversal of 666065560 is 65560666.

It is a happy number.

It is a super-2 number, since 2×666065560² = 887286660436227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 16651639 = 666065560 / (6 + 6 + 6 + 0 + 6 + 5 + 5 + 6 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666065563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8325780 + ... + 8325859.

It is an arithmetic number, because the mean of its divisors is an integer number (93665475).

Almost surely, 2^666065560 is an apocalyptic number.

It is an amenable number.

666065560 is an abundant number, since it is smaller than the sum of its proper divisors (832582040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666065560 is a wasteful number, since it uses less digits than its factorization.

666065560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16651650 (or 16651646 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 666065560 is about 25808.2459690697. The cubic root of 666065560 is about 873.3178282636.

The spelling of 666065560 in words is "six hundred sixty-six million, sixty-five thousand, five hundred sixty".