19675165121 has 4 divisors (see below), whose sum is σ = 19709264772. Its totient is φ = 19641065472.

The previous prime is 19675165109. The next prime is 19675165187. The reversal of 19675165121 is 12156157691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16441650625 + 3233514496 = 128225^2 + 56864^2 .

It is a cyclic number.

It is not a de Polignac number, because 19675165121 - 2¹⁰ = 19675164097 is a prime.

It is a super-2 number, since 2×19675165121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19675165021) 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, 17048960 + ... + 17050113.

It is an arithmetic number, because the mean of its divisors is an integer number (4927316193).

Almost surely, 2^19675165121 is an apocalyptic number.

It is an amenable number.

19675165121 is a deficient number, since it is larger than the sum of its proper divisors (34099651).

19675165121 is an equidigital number, since it uses as much as digits as its factorization.

19675165121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34099650.

The product of its digits is 113400, while the sum is 44.

The spelling of 19675165121 in words is "nineteen billion, six hundred seventy-five million, one hundred sixty-five thousand, one hundred twenty-one".