18918701656 has 16 divisors (see below), whose sum is σ = 35485856640. Its totient is φ = 9455806560.

The previous prime is 18918701653. The next prime is 18918701663. The reversal of 18918701656 is 65610781981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918701653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420280 + ... + 463111.

It is an arithmetic number, because the mean of its divisors is an integer number (2217866040).

Almost surely, 2^18918701656 is an apocalyptic number.

It is an amenable number.

18918701656 is a deficient number, since it is larger than the sum of its proper divisors (16567154984).

18918701656 is a wasteful number, since it uses less digits than its factorization.

18918701656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886074 (or 886070 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 18918701656 in words is "eighteen billion, nine hundred eighteen million, seven hundred one thousand, six hundred fifty-six".