161840269505 has 8 divisors (see below), whose sum is σ = 200473108224. Its totient is φ = 125295692400.

The previous prime is 161840269477. The next prime is 161840269517. The reversal of 161840269505 is 505962048161.

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

It is not a de Polignac number, because 161840269505 - 2⁶ = 161840269441 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 161840269505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522065231 + ... + 522065540.

It is an arithmetic number, because the mean of its divisors is an integer number (25059138528).

Almost surely, 2^161840269505 is an apocalyptic number.

It is an amenable number.

161840269505 is a deficient number, since it is larger than the sum of its proper divisors (38632838719).

161840269505 is a wasteful number, since it uses less digits than its factorization.

161840269505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044130807.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 161840269505 in words is "one hundred sixty-one billion, eight hundred forty million, two hundred sixty-nine thousand, five hundred five".