15660818672 has 20 divisors (see below), whose sum is σ = 30346108320. Its totient is φ = 7829564928.

The previous prime is 15660818671. The next prime is 15660818707. The reversal of 15660818672 is 27681806651.

It is a super-2 number, since 2×15660818672² (a number of 21 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 15660818672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15660818671) 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, 116729 + ... + 212007.

It is an arithmetic number, because the mean of its divisors is an integer number (1517305416).

Almost surely, 2^15660818672 is an apocalyptic number.

It is an amenable number.

15660818672 is a deficient number, since it is larger than the sum of its proper divisors (14685289648).

15660818672 is a wasteful number, since it uses less digits than its factorization.

15660818672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105560 (or 105554 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 15660818672 in words is "fifteen billion, six hundred sixty million, eight hundred eighteen thousand, six hundred seventy-two".