19707884765 has 16 divisors (see below), whose sum is σ = 24872030208. Its totient is φ = 14962058496.

The previous prime is 19707884747. The next prime is 19707884771. The reversal of 19707884765 is 56748870791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19707884765 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19707884698 and 19707884707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660092 + ... + 689301.

It is an arithmetic number, because the mean of its divisors is an integer number (1554501888).

Almost surely, 2^19707884765 is an apocalyptic number.

It is an amenable number.

19707884765 is a deficient number, since it is larger than the sum of its proper divisors (5164145443).

19707884765 is a wasteful number, since it uses less digits than its factorization.

19707884765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349548.

The product of its (nonzero) digits is 23708160, while the sum is 62.

The spelling of 19707884765 in words is "nineteen billion, seven hundred seven million, eight hundred eighty-four thousand, seven hundred sixty-five".