19649488916 has 24 divisors (see below), whose sum is σ = 35372109696. Its totient is φ = 9544016160.

The previous prime is 19649488897. The next prime is 19649488919. The reversal of 19649488916 is 61988494691.

It is a super-2 number, since 2×19649488916² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649488919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11816 + ... + 198591.

It is an arithmetic number, because the mean of its divisors is an integer number (1473837904).

Almost surely, 2^19649488916 is an apocalyptic number.

It is an amenable number.

19649488916 is a deficient number, since it is larger than the sum of its proper divisors (15722620780).

19649488916 is a wasteful number, since it uses less digits than its factorization.

19649488916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211079 (or 211077 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 65.

The spelling of 19649488916 in words is "nineteen billion, six hundred forty-nine million, four hundred eighty-eight thousand, nine hundred sixteen".