660166446687 has 12 divisors (see below), whose sum is σ = 967516666200. Its totient is φ = 400100876560.

The previous prime is 660166446679. The next prime is 660166446697. The reversal of 660166446687 is 786644661066.

It is a happy number.

It is not a de Polignac number, because 660166446687 - 2³ = 660166446679 is a prime.

It is a super-2 number, since 2×660166446687² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660166446687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660166446697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 909319812 + ... + 909320537.

It is an arithmetic number, because the mean of its divisors is an integer number (80626388850).

Almost surely, 2^660166446687 is an apocalyptic number.

660166446687 is a deficient number, since it is larger than the sum of its proper divisors (307350219513).

660166446687 is a wasteful number, since it uses less digits than its factorization.

660166446687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818640374 (or 1818640363 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 60.

The spelling of 660166446687 in words is "six hundred sixty billion, one hundred sixty-six million, four hundred forty-six thousand, six hundred eighty-seven".