16265505642161 has 4 divisors (see below), whose sum is σ = 16265564822052. Its totient is φ = 16265446462272.

The previous prime is 16265505642107. The next prime is 16265505642167. The reversal of 16265505642161 is 16124650556261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2042952803761 + 14222552838400 = 1429319^2 + 3771280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16265505642161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16265505642167) 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, 29175740 + ... + 29728013.

It is an arithmetic number, because the mean of its divisors is an integer number (4066391205513).

Almost surely, 2^{16265505642161} is an apocalyptic number.

It is an amenable number.

16265505642161 is a deficient number, since it is larger than the sum of its proper divisors (59179891).

16265505642161 is an equidigital number, since it uses as much as digits as its factorization.

16265505642161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59179890.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 16265505642161 in words is "sixteen trillion, two hundred sixty-five billion, five hundred five million, six hundred forty-two thousand, one hundred sixty-one".