18616980944 has 20 divisors (see below), whose sum is σ = 36427536420. Its totient is φ = 9216326400.

The previous prime is 18616980917. The next prime is 18616981003. The reversal of 18616980944 is 44908961681.

It can be written as a sum of positive squares in 2 ways, for example, as 15207822400 + 3409158544 = 123320^2 + 58388^2 .

It is a super-2 number, since 2×18616980944² (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 18616980944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5758589 + ... + 5761820.

It is an arithmetic number, because the mean of its divisors is an integer number (1821376821).

Almost surely, 2^18616980944 is an apocalyptic number.

It is an amenable number.

18616980944 is a deficient number, since it is larger than the sum of its proper divisors (17810555476).

18616980944 is a wasteful number, since it uses less digits than its factorization.

18616980944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11520518 (or 11520512 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 18616980944 in words is "eighteen billion, six hundred sixteen million, nine hundred eighty thousand, nine hundred forty-four".