19916899864 has 16 divisors (see below), whose sum is σ = 38967847920. Its totient is φ = 9525473760.

The previous prime is 19916899861. The next prime is 19916899957. The reversal of 19916899864 is 46899861991.

It is a junction number, because it is equal to n+sod(n) for n = 19916899793 and 19916899802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19916899861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54121827 + ... + 54122194.

It is an arithmetic number, because the mean of its divisors is an integer number (2435490495).

Almost surely, 2^19916899864 is an apocalyptic number.

It is an amenable number.

19916899864 is a deficient number, since it is larger than the sum of its proper divisors (19050948056).

19916899864 is a wasteful number, since it uses less digits than its factorization.

19916899864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108244050 (or 108244046 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 70.

The spelling of 19916899864 in words is "nineteen billion, nine hundred sixteen million, eight hundred ninety-nine thousand, eight hundred sixty-four".