16665645652 has 12 divisors (see below), whose sum is σ = 29167678260. Its totient is φ = 8332023296.

The previous prime is 16665645643. The next prime is 16665645653. The reversal of 16665645652 is 25654656661.

It can be written as a sum of positive squares in 2 ways, for example, as 10823489296 + 5842156356 = 104036^2 + 76434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16665645652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665645653) 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, 151693 + ... + 237364.

It is an arithmetic number, because the mean of its divisors is an integer number (2430639855).

Almost surely, 2^16665645652 is an apocalyptic number.

It is an amenable number.

16665645652 is a deficient number, since it is larger than the sum of its proper divisors (12502032608).

16665645652 is a wasteful number, since it uses less digits than its factorization.

16665645652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399770 (or 399768 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 52.

The spelling of 16665645652 in words is "sixteen billion, six hundred sixty-five million, six hundred forty-five thousand, six hundred fifty-two".