122161404565 has 4 divisors (see below), whose sum is σ = 146593685484. Its totient is φ = 97729123648.

The previous prime is 122161404551. The next prime is 122161404569. The reversal of 122161404565 is 565404161221.

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 23189502961 + 98971901604 = 152281^2 + 314598^2 .

It is a cyclic number.

It is not a de Polignac number, because 122161404565 - 2¹⁵ = 122161371797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122161404569) 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, 12216140452 + ... + 12216140461.

It is an arithmetic number, because the mean of its divisors is an integer number (36648421371).

Almost surely, 2^122161404565 is an apocalyptic number.

It is an amenable number.

122161404565 is a deficient number, since it is larger than the sum of its proper divisors (24432280919).

122161404565 is an equidigital number, since it uses as much as digits as its factorization.

122161404565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24432280918.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 122161404565 its reverse (565404161221), we get a palindrome (687565565786).

The spelling of 122161404565 in words is "one hundred twenty-two billion, one hundred sixty-one million, four hundred four thousand, five hundred sixty-five".