19907364161 has 4 divisors (see below), whose sum is σ = 20131042500. Its totient is φ = 19683685824.

The previous prime is 19907364131. The next prime is 19907364203. The reversal of 19907364161 is 16146370991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16146370991 = 6263 ⋅2578057.

It can be written as a sum of positive squares in 2 ways, for example, as 7643130625 + 12264233536 = 87425^2 + 110744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19907364161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19907364131) 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, 111839036 + ... + 111839213.

It is an arithmetic number, because the mean of its divisors is an integer number (5032760625).

Almost surely, 2^19907364161 is an apocalyptic number.

It is an amenable number.

19907364161 is a deficient number, since it is larger than the sum of its proper divisors (223678339).

19907364161 is an equidigital number, since it uses as much as digits as its factorization.

19907364161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223678338.

The product of its (nonzero) digits is 244944, while the sum is 47.

The spelling of 19907364161 in words is "nineteen billion, nine hundred seven million, three hundred sixty-four thousand, one hundred sixty-one".