18720244158664 has 32 divisors (see below), whose sum is σ = 35445851925120. Its totient is φ = 9268040635776.

The previous prime is 18720244158659. The next prime is 18720244158691. The reversal of 18720244158664 is 46685144202781.

It is a super-2 number, since 2×18720244158664² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18720244158599 and 18720244158608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4872604 + ... + 7821940.

It is an arithmetic number, because the mean of its divisors is an integer number (1107682872660).

Almost surely, 2^{18720244158664} is an apocalyptic number.

It is an amenable number.

18720244158664 is a deficient number, since it is larger than the sum of its proper divisors (16725607766456).

18720244158664 is a wasteful number, since it uses less digits than its factorization.

18720244158664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957149 (or 2957145 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 58.

The spelling of 18720244158664 in words is "eighteen trillion, seven hundred twenty billion, two hundred forty-four million, one hundred fifty-eight thousand, six hundred sixty-four".