18979051520 has 288 divisors, whose sum is σ = 53847808560. Its totient is φ = 6364200960.

The previous prime is 18979051517. The next prime is 18979051547. The reversal of 18979051520 is 2515097981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19035662 + ... + 19036658.

Almost surely, 2^18979051520 is an apocalyptic number.

18979051520 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 18979051520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26923904280).

18979051520 is an abundant number, since it is smaller than the sum of its proper divisors (34868757040).

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

18979051520 is a wasteful number, since it uses less digits than its factorization.

18979051520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1028 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 47.

The spelling of 18979051520 in words is "eighteen billion, nine hundred seventy-nine million, fifty-one thousand, five hundred twenty".