19618421496 has 128 divisors (see below), whose sum is σ = 51106090560. Its totient is φ = 6270566400.

The previous prime is 19618421483. The next prime is 19618421503. The reversal of 19618421496 is 69412481691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36262986 + ... + 36263526.

Almost surely, 2^19618421496 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 19618421496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25553045280).

19618421496 is an abundant number, since it is smaller than the sum of its proper divisors (31487669064).

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

19618421496 is a wasteful number, since it uses less digits than its factorization.

19618421496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1101 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The spelling of 19618421496 in words is "nineteen billion, six hundred eighteen million, four hundred twenty-one thousand, four hundred ninety-six".