16466561405 has 16 divisors (see below), whose sum is σ = 22815528960. Its totient is φ = 11174948352.

The previous prime is 16466561401. The next prime is 16466561411. The reversal of 16466561405 is 50416566461.

It is a cyclic number.

It is not a de Polignac number, because 16466561405 - 2² = 16466561401 is a prime.

It is a super-2 number, since 2×16466561405² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16466561401) 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 15 ways as a sum of consecutive naturals, for example, 2421725 + ... + 2428514.

It is an arithmetic number, because the mean of its divisors is an integer number (1425970560).

Almost surely, 2^16466561405 is an apocalyptic number.

It is an amenable number.

16466561405 is a deficient number, since it is larger than the sum of its proper divisors (6348967555).

16466561405 is an equidigital number, since it uses as much as digits as its factorization.

16466561405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850348.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 16466561405 in words is "sixteen billion, four hundred sixty-six million, five hundred sixty-one thousand, four hundred five".