19536996864 has 240 divisors, whose sum is σ = 65386689984. Its totient is φ = 5074206720.

The previous prime is 19536996841. The next prime is 19536996877. The reversal of 19536996864 is 46869963591.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 19536996795 and 19536996804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1293484 + ... + 1308500.

Almost surely, 2^19536996864 is an apocalyptic number.

19536996864 is a gapful number since it is divisible by the number (14) 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 19536996864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32693344992).

19536996864 is an abundant number, since it is smaller than the sum of its proper divisors (45849693120).

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

19536996864 is a wasteful number, since it uses less digits than its factorization.

19536996864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15067 (or 15040 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 66.

The spelling of 19536996864 in words is "nineteen billion, five hundred thirty-six million, nine hundred ninety-six thousand, eight hundred sixty-four".