161034994009 has 4 divisors (see below), whose sum is σ = 161035800804. Its totient is φ = 161034187216.

The previous prime is 161034994007. The next prime is 161034994031. The reversal of 161034994009 is 900499430161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 62923214025 + 98111779984 = 250845^2 + 313228^2 .

It is a cyclic number.

It is not a de Polignac number, because 161034994009 - 2¹ = 161034994007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161034994009.

It is not an unprimeable number, because it can be changed into a prime (161034994007) 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, 139959 + ... + 584515.

It is an arithmetic number, because the mean of its divisors is an integer number (40258950201).

Almost surely, 2^161034994009 is an apocalyptic number.

It is an amenable number.

161034994009 is a deficient number, since it is larger than the sum of its proper divisors (806795).

161034994009 is an equidigital number, since it uses as much as digits as its factorization.

161034994009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806794.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 161034994009 in words is "one hundred sixty-one billion, thirty-four million, nine hundred ninety-four thousand, nine".