18491656980960 has 384 divisors, whose sum is σ = 65973177768960. Its totient is φ = 4835777476608.

The previous prime is 18491656980833. The next prime is 18491656980977. The reversal of 18491656980960 is 6908965619481.

18491656980960 is a `hidden beast` number, since 1 + 8 + 49 + 16 + 569 + 8 + 0 + 9 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 513539277 + ... + 513575283.

It is an arithmetic number, because the mean of its divisors is an integer number (171805150440).

Almost surely, 2^{18491656980960} is an apocalyptic number.

18491656980960 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 18491656980960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32986588884480).

18491656980960 is an abundant number, since it is smaller than the sum of its proper divisors (47481520788000).

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

18491656980960 is a wasteful number, since it uses less digits than its factorization.

18491656980960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38327 (or 38313 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 72.

The spelling of 18491656980960 in words is "eighteen trillion, four hundred ninety-one billion, six hundred fifty-six million, nine hundred eighty thousand, nine hundred sixty".