19699344697 has 16 divisors (see below), whose sum is σ = 20587588560. Its totient is φ = 18836064000.

The previous prime is 19699344641. The next prime is 19699344703. The reversal of 19699344697 is 79644399691.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 747967801 + 18951376896 = 27349^2 + 137664^2 .

It is a cyclic number.

It is not a de Polignac number, because 19699344697 - 2²⁷ = 19565126969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19699344617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324447 + ... + 380347.

It is an arithmetic number, because the mean of its divisors is an integer number (1286724285).

Almost surely, 2^19699344697 is an apocalyptic number.

It is an amenable number.

19699344697 is a deficient number, since it is larger than the sum of its proper divisors (888243863).

19699344697 is a wasteful number, since it uses less digits than its factorization.

19699344697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56124.

The product of its digits is 79361856, while the sum is 67.

The spelling of 19699344697 in words is "nineteen billion, six hundred ninety-nine million, three hundred forty-four thousand, six hundred ninety-seven".