666061605516 has 24 divisors (see below), whose sum is σ = 1554157410624. Its totient is φ = 222018583120.

The previous prime is 666061605511. The next prime is 666061605541. The reversal of 666061605516 is 615506160666.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (666061605511) 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, 2012131 + ... + 2319653.

It is an arithmetic number, because the mean of its divisors is an integer number (64756558776).

Almost surely, 2^666061605516 is an apocalyptic number.

It is an amenable number.

666061605516 is an abundant number, since it is smaller than the sum of its proper divisors (888095805108).

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

666061605516 is a wasteful number, since it uses less digits than its factorization.

666061605516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488021 (or 488019 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 666061605516 in words is "six hundred sixty-six billion, sixty-one million, six hundred five thousand, five hundred sixteen".