19866913764 has 48 divisors (see below), whose sum is σ = 46681658688. Its totient is φ = 6575856768.

The previous prime is 19866913751. The next prime is 19866913769. The reversal of 19866913764 is 46731966891.

It is a junction number, because it is equal to n+sod(n) for n = 19866913698 and 19866913707.

It is not an unprimeable number, because it can be changed into a prime (19866913769) 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 15 ways as a sum of consecutive naturals, for example, 4419502 + ... + 4423994.

It is an arithmetic number, because the mean of its divisors is an integer number (972534556).

Almost surely, 2^19866913764 is an apocalyptic number.

It is an amenable number.

19866913764 is an abundant number, since it is smaller than the sum of its proper divisors (26814744924).

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

19866913764 is a wasteful number, since it uses less digits than its factorization.

19866913764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004 (or 7002 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 60.

The spelling of 19866913764 in words is "nineteen billion, eight hundred sixty-six million, nine hundred thirteen thousand, seven hundred sixty-four".