161451405409 has 12 divisors (see below), whose sum is σ = 187856561664. Its totient is φ = 138353213544.

The previous prime is 161451405397. The next prime is 161451405469. The reversal of 161451405409 is 904504154161.

It is a de Polignac number, because none of the positive numbers 2^k-161451405409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161451405469) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196969 + ... + 601414.

It is an arithmetic number, because the mean of its divisors is an integer number (15654713472).

Almost surely, 2^161451405409 is an apocalyptic number.

It is an amenable number.

161451405409 is a deficient number, since it is larger than the sum of its proper divisors (26405156255).

161451405409 is an equidigital number, since it uses as much as digits as its factorization.

161451405409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802524 (or 802517 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 161451405409 in words is "one hundred sixty-one billion, four hundred fifty-one million, four hundred five thousand, four hundred nine".