19518711234 has 64 divisors (see below), whose sum is σ = 43037609472. Its totient is φ = 5852217600.

The previous prime is 19518711227. The next prime is 19518711271. The reversal of 19518711234 is 43211781591.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9158349 + ... + 9160479.

It is an arithmetic number, because the mean of its divisors is an integer number (672462648).

Almost surely, 2^19518711234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19518711234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21518804736).

19518711234 is an abundant number, since it is smaller than the sum of its proper divisors (23518898238).

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

19518711234 is a wasteful number, since it uses less digits than its factorization.

19518711234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551.

The product of its digits is 60480, while the sum is 42.

The spelling of 19518711234 in words is "nineteen billion, five hundred eighteen million, seven hundred eleven thousand, two hundred thirty-four".