16465361661 has 18 divisors (see below), whose sum is σ = 27666288702. Its totient is φ = 9408777840.

The previous prime is 16465361599. The next prime is 16465361771. The reversal of 16465361661 is 16616356461.

16465361661 is a `hidden beast` number, since 1 + 6 + 46 + 536 + 16 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16334373636 + 130988025 = 127806^2 + 11445^2 .

It is not a de Polignac number, because 16465361661 - 2⁷ = 16465361533 is a prime.

It is a super-2 number, since 2×16465361661² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16465361161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18667770 + ... + 18668651.

It is an arithmetic number, because the mean of its divisors is an integer number (1537016039).

Almost surely, 2^16465361661 is an apocalyptic number.

It is an amenable number.

16465361661 is a deficient number, since it is larger than the sum of its proper divisors (11200927041).

16465361661 is a wasteful number, since it uses less digits than its factorization.

16465361661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37336441 (or 37336431 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 16465361661 in words is "sixteen billion, four hundred sixty-five million, three hundred sixty-one thousand, six hundred sixty-one".