19722379665 has 8 divisors (see below), whose sum is σ = 31555807488. Its totient is φ = 10518602480.

The previous prime is 19722379657. The next prime is 19722379669. The reversal of 19722379665 is 56697322791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19722379665 - 2³ = 19722379657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19722379669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657412641 + ... + 657412670.

It is an arithmetic number, because the mean of its divisors is an integer number (3944475936).

Almost surely, 2^19722379665 is an apocalyptic number.

19722379665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19722379665 is a deficient number, since it is larger than the sum of its proper divisors (11833427823).

19722379665 is a wasteful number, since it uses less digits than its factorization.

19722379665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314825319.

The product of its digits is 8573040, while the sum is 57.

The spelling of 19722379665 in words is "nineteen billion, seven hundred twenty-two million, three hundred seventy-nine thousand, six hundred sixty-five".