19797491715 has 16 divisors (see below), whose sum is σ = 32697793536. Its totient is φ = 10218060000.

The previous prime is 19797491711. The next prime is 19797491723. The reversal of 19797491715 is 51719479791.

It is not a de Polignac number, because 19797491715 - 2² = 19797491711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19797491711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21287161 + ... + 21288090.

It is an arithmetic number, because the mean of its divisors is an integer number (2043612096).

Almost surely, 2^19797491715 is an apocalyptic number.

19797491715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19797491715 is a deficient number, since it is larger than the sum of its proper divisors (12900301821).

19797491715 is a wasteful number, since it uses less digits than its factorization.

19797491715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42575290.

The product of its digits is 5000940, while the sum is 60.

The spelling of 19797491715 in words is "nineteen billion, seven hundred ninety-seven million, four hundred ninety-one thousand, seven hundred fifteen".