19477227917 has 4 divisors (see below), whose sum is σ = 22259689056. Its totient is φ = 16694766780.

The previous prime is 19477227881. The next prime is 19477227943. The reversal of 19477227917 is 71972277491.

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 a de Polignac number, because none of the positive numbers 2^k-19477227917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19477229917) 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, 1391230559 + ... + 1391230572.

It is an arithmetic number, because the mean of its divisors is an integer number (5564922264).

Almost surely, 2^19477227917 is an apocalyptic number.

It is an amenable number.

19477227917 is a deficient number, since it is larger than the sum of its proper divisors (2782461139).

19477227917 is an equidigital number, since it uses as much as digits as its factorization.

19477227917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782461138.

The product of its digits is 3111696, while the sum is 56.

The spelling of 19477227917 in words is "nineteen billion, four hundred seventy-seven million, two hundred twenty-seven thousand, nine hundred seventeen".