19813980464 has 20 divisors (see below), whose sum is σ = 39113920656. Its totient is φ = 9720065472.

The previous prime is 19813980427. The next prime is 19813980469. The reversal of 19813980464 is 46408931891.

It is a super-3 number, since 3×19813980464³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (19813980469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11681924 + ... + 11683619.

Almost surely, 2^19813980464 is an apocalyptic number.

It is an amenable number.

19813980464 is a deficient number, since it is larger than the sum of its proper divisors (19299940192).

19813980464 is a wasteful number, since it uses less digits than its factorization.

19813980464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23365604 (or 23365598 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 19813980464 in words is "nineteen billion, eight hundred thirteen million, nine hundred eighty thousand, four hundred sixty-four".