19321218516 has 24 divisors (see below), whose sum is σ = 45296511904. Its totient is φ = 6409882080.

The previous prime is 19321218451. The next prime is 19321218551. The reversal of 19321218516 is 61581212391.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3812875 + ... + 3817938.

Almost surely, 2^19321218516 is an apocalyptic number.

It is an amenable number.

19321218516 is an abundant number, since it is smaller than the sum of its proper divisors (25975293388).

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

19321218516 is a wasteful number, since it uses less digits than its factorization.

19321218516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631031 (or 7631029 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The spelling of 19321218516 in words is "nineteen billion, three hundred twenty-one million, two hundred eighteen thousand, five hundred sixteen".