19641405696 has 144 divisors (see below), whose sum is σ = 57810043200. Its totient is φ = 5870223360.

The previous prime is 19641405649. The next prime is 19641405709. The reversal of 19641405696 is 69650414691.

It is a happy number.

It is a super-2 number, since 2×19641405696² (a number of 21 digits) contains 22 as substring.

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, 600780 + ... + 632628.

Almost surely, 2^19641405696 is an apocalyptic number.

19641405696 is a gapful number since it is divisible by the number (16) 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 19641405696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28905021600).

19641405696 is an abundant number, since it is smaller than the sum of its proper divisors (38168637504).

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

19641405696 is a wasteful number, since it uses less digits than its factorization.

19641405696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31952 (or 31938 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 19641405696 in words is "nineteen billion, six hundred forty-one million, four hundred five thousand, six hundred ninety-six".