19797318605 has 8 divisors (see below), whose sum is σ = 24398857752. Its totient is φ = 15409804608.

The previous prime is 19797318557. The next prime is 19797318623. The reversal of 19797318605 is 50681379791.

It can be written as a sum of positive squares in 4 ways, for example, as 1349974564 + 18447344041 = 36742^2 + 135821^2 .

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 19797318605 - 2⁸ = 19797318349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53506082 + ... + 53506451.

It is an arithmetic number, because the mean of its divisors is an integer number (3049857219).

Almost surely, 2^19797318605 is an apocalyptic number.

It is an amenable number.

19797318605 is a deficient number, since it is larger than the sum of its proper divisors (4601539147).

19797318605 is a wasteful number, since it uses less digits than its factorization.

19797318605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107012575.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The spelling of 19797318605 in words is "nineteen billion, seven hundred ninety-seven million, three hundred eighteen thousand, six hundred five".