18646990560 has 960 divisors, whose sum is σ = 77138417664. Its totient is φ = 4231941120.

The previous prime is 18646990553. The next prime is 18646990561. The reversal of 18646990560 is 6509964681.

It is a happy number.

18646990560 is a `hidden beast` number, since 18 + 6 + 4 + 69 + 9 + 0 + 560 = 666.

It is a super-2 number, since 2×18646990560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 18646990497 and 18646990506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18646990561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 396744457 + ... + 396744503.

Almost surely, 2^18646990560 is an apocalyptic number.

18646990560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18646990560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38569208832).

18646990560 is an abundant number, since it is smaller than the sum of its proper divisors (58491427104).

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

18646990560 is a wasteful number, since it uses less digits than its factorization.

18646990560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 18646990560 in words is "eighteen billion, six hundred forty-six million, nine hundred ninety thousand, five hundred sixty".