19671864388 has 12 divisors (see below), whose sum is σ = 37555377552. Its totient is φ = 8941756520.

The previous prime is 19671864367. The next prime is 19671864389. The reversal of 19671864388 is 88346817691.

It is a super-2 number, since 2×19671864388² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19671864389) 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, 223543870 + ... + 223543957.

It is an arithmetic number, because the mean of its divisors is an integer number (3129614796).

Almost surely, 2^19671864388 is an apocalyptic number.

It is an amenable number.

19671864388 is a deficient number, since it is larger than the sum of its proper divisors (17883513164).

19671864388 is a wasteful number, since it uses less digits than its factorization.

19671864388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447087842 (or 447087840 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 61.

The spelling of 19671864388 in words is "nineteen billion, six hundred seventy-one million, eight hundred sixty-four thousand, three hundred eighty-eight".