19697649399 has 6 divisors (see below), whose sum is σ = 28452160256. Its totient is φ = 13131766260.

The previous prime is 19697649373. The next prime is 19697649407. The reversal of 19697649399 is 99394679691.

19697649399 is a `hidden beast` number, since 1 + 9 + 69 + 76 + 493 + 9 + 9 = 666.

It is not a de Polignac number, because 19697649399 - 2⁸ = 19697649143 is a prime.

It is a super-2 number, since 2×19697649399² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19697649319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1094313847 + ... + 1094313864.

Almost surely, 2^19697649399 is an apocalyptic number.

19697649399 is a deficient number, since it is larger than the sum of its proper divisors (8754510857).

19697649399 is a wasteful number, since it uses less digits than its factorization.

19697649399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188627717 (or 2188627714 counting only the distinct ones).

The product of its digits is 178564176, while the sum is 72.

The spelling of 19697649399 in words is "nineteen billion, six hundred ninety-seven million, six hundred forty-nine thousand, three hundred ninety-nine".