18779995801 has 4 divisors (see below), whose sum is σ = 21462852352. Its totient is φ = 16097139252.

The previous prime is 18779995799. The next prime is 18779995837. The reversal of 18779995801 is 10859997781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18779995801 - 2¹ = 18779995799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18779995891) 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, 1341428265 + ... + 1341428278.

It is an arithmetic number, because the mean of its divisors is an integer number (5365713088).

Almost surely, 2^18779995801 is an apocalyptic number.

It is an amenable number.

18779995801 is a deficient number, since it is larger than the sum of its proper divisors (2682856551).

18779995801 is an equidigital number, since it uses as much as digits as its factorization.

18779995801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682856550.

The product of its (nonzero) digits is 11430720, while the sum is 64.

The spelling of 18779995801 in words is "eighteen billion, seven hundred seventy-nine million, nine hundred ninety-five thousand, eight hundred one".