18797473656 has 320 divisors, whose sum is σ = 58442186880. Its totient is φ = 5608673280.

The previous prime is 18797473637. The next prime is 18797473657. The reversal of 18797473656 is 65637479781.

18797473656 is a `hidden beast` number, since 18 + 7 + 97 + 473 + 65 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18797473593 and 18797473602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18797473657) 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 79 ways as a sum of consecutive naturals, for example, 77997696 + ... + 77997936.

It is an arithmetic number, because the mean of its divisors is an integer number (182631834).

Almost surely, 2^18797473656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18797473656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29221093440).

18797473656 is an abundant number, since it is smaller than the sum of its proper divisors (39644713224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18797473656 is a wasteful number, since it uses less digits than its factorization.

18797473656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 503 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 63.

The spelling of 18797473656 in words is "eighteen billion, seven hundred ninety-seven million, four hundred seventy-three thousand, six hundred fifty-six".