18781612523520 has 960 divisors, whose sum is σ = 75375281673216. Its totient is φ = 3879437598720.

The previous prime is 18781612523503. The next prime is 18781612523537. The reversal of 18781612523520 is 2532521618781.

It is an interprime number because it is at equal distance from previous prime (18781612523503) and next prime (18781612523537).

It is a tau number, because it is divible by the number of its divisors (960).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3273766092 + ... + 3273771828.

Almost surely, 2^{18781612523520} is an apocalyptic number.

18781612523520 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 18781612523520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37687640836608).

18781612523520 is an abundant number, since it is smaller than the sum of its proper divisors (56593669149696).

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

18781612523520 is a wasteful number, since it uses less digits than its factorization.

18781612523520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964 (or 5938 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 18781612523520 in words is "eighteen trillion, seven hundred eighty-one billion, six hundred twelve million, five hundred twenty-three thousand, five hundred twenty".