19999010161 has 8 divisors (see below), whose sum is σ = 21539445480. Its totient is φ = 18458867712.

The previous prime is 19999010153. The next prime is 19999010203. The reversal of 19999010161 is 16101099991.

It can be written as a sum of positive squares in 4 ways, for example, as 170145936 + 19828864225 = 13044^2 + 140815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19999010161 - 2³ = 19999010153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999010111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80595 + ... + 215623.

It is an arithmetic number, because the mean of its divisors is an integer number (2692430685).

Almost surely, 2^19999010161 is an apocalyptic number.

It is an amenable number.

19999010161 is a deficient number, since it is larger than the sum of its proper divisors (1540435319).

19999010161 is a wasteful number, since it uses less digits than its factorization.

19999010161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146435.

The product of its (nonzero) digits is 39366, while the sum is 46.

The spelling of 19999010161 in words is "nineteen billion, nine hundred ninety-nine million, ten thousand, one hundred sixty-one".