18953320512 has 112 divisors (see below), whose sum is σ = 57514898432. Its totient is φ = 5395991040.

The previous prime is 18953320489. The next prime is 18953320523. The reversal of 18953320512 is 21502335981.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355437 + ... + 405267.

Almost surely, 2^18953320512 is an apocalyptic number.

18953320512 is a gapful number since it is divisible by the number (12) 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 18953320512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28757449216).

18953320512 is an abundant number, since it is smaller than the sum of its proper divisors (38561577920).

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

18953320512 is a wasteful number, since it uses less digits than its factorization.

18953320512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50136 (or 50126 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 18953320512 in words is "eighteen billion, nine hundred fifty-three million, three hundred twenty thousand, five hundred twelve".