19713634397 has 8 divisors (see below), whose sum is σ = 20608368576. Its totient is φ = 18822035232.

The previous prime is 19713634387. The next prime is 19713634453. The reversal of 19713634397 is 79343631791.

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

It is a cyclic number.

It is not a de Polignac number, because 19713634397 - 2¹² = 19713630301 is a prime.

It is a super-2 number, since 2×19713634397² (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 (19713634307) 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, 770888 + ... + 796049.

It is an arithmetic number, because the mean of its divisors is an integer number (2576046072).

Almost surely, 2^19713634397 is an apocalyptic number.

It is an amenable number.

19713634397 is a deficient number, since it is larger than the sum of its proper divisors (894734179).

19713634397 is a wasteful number, since it uses less digits than its factorization.

19713634397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567507.

The product of its digits is 2571912, while the sum is 53.

The spelling of 19713634397 in words is "nineteen billion, seven hundred thirteen million, six hundred thirty-four thousand, three hundred ninety-seven".