19701193679 has 4 divisors (see below), whose sum is σ = 20181710640. Its totient is φ = 19220676720.

The previous prime is 19701193669. The next prime is 19701193709. The reversal of 19701193679 is 97639110791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19701193679 - 2¹⁶ = 19701128143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19701193679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19701193619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240258419 + ... + 240258500.

It is an arithmetic number, because the mean of its divisors is an integer number (5045427660).

Almost surely, 2^19701193679 is an apocalyptic number.

19701193679 is a deficient number, since it is larger than the sum of its proper divisors (480516961).

19701193679 is an equidigital number, since it uses as much as digits as its factorization.

19701193679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480516960.

The product of its (nonzero) digits is 642978, while the sum is 53.

The spelling of 19701193679 in words is "nineteen billion, seven hundred one million, one hundred ninety-three thousand, six hundred seventy-nine".