18909603744 has 96 divisors (see below), whose sum is σ = 53419455936. Its totient is φ = 5835141120.

The previous prime is 18909603731. The next prime is 18909603763. The reversal of 18909603744 is 44730690981.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×18909603744² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 4579 + ... + 194525.

It is an arithmetic number, because the mean of its divisors is an integer number (556452666).

Almost surely, 2^18909603744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18909603744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26709727968).

18909603744 is an abundant number, since it is smaller than the sum of its proper divisors (34509852192).

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

18909603744 is a wasteful number, since it uses less digits than its factorization.

18909603744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190038 (or 190030 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 18909603744 in words is "eighteen billion, nine hundred nine million, six hundred three thousand, seven hundred forty-four".