161001111565 has 16 divisors (see below), whose sum is σ = 221058610560. Its totient is φ = 110272219200.

The previous prime is 161001111563. The next prime is 161001111581. The reversal of 161001111565 is 565111100161.

It is not a de Polignac number, because 161001111565 - 2¹ = 161001111563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161001111563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2647486 + ... + 2707615.

It is an arithmetic number, because the mean of its divisors is an integer number (13816163160).

Almost surely, 2^161001111565 is an apocalyptic number.

It is an amenable number.

161001111565 is a deficient number, since it is larger than the sum of its proper divisors (60057498995).

161001111565 is an equidigital number, since it uses as much as digits as its factorization.

161001111565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355972.

The product of its (nonzero) digits is 900, while the sum is 28.

The spelling of 161001111565 in words is "one hundred sixty-one billion, one million, one hundred eleven thousand, five hundred sixty-five".