1659566599966 has 12 divisors (see below), whose sum is σ = 2736227576376. Its totient is φ = 754348454420.

The previous prime is 1659566599927. The next prime is 1659566599969. The reversal of 1659566599966 is 6699956659561.

It is a super-2 number, since 2×1659566599966² (a number of 25 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 1659566599966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659566599969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3428856370 + ... + 3428856853.

It is an arithmetic number, because the mean of its divisors is an integer number (228018964698).

Almost surely, 2^{1659566599966} is an apocalyptic number.

1659566599966 is a deficient number, since it is larger than the sum of its proper divisors (1076660976410).

1659566599966 is a wasteful number, since it uses less digits than its factorization.

1659566599966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857713247 (or 6857713236 counting only the distinct ones).

The product of its digits is 6377292000, while the sum is 82.

The spelling of 1659566599966 in words is "one trillion, six hundred fifty-nine billion, five hundred sixty-six million, five hundred ninety-nine thousand, nine hundred sixty-six".