16641910465 has 4 divisors (see below), whose sum is σ = 19970292564. Its totient is φ = 13313528368.

The previous prime is 16641910433. The next prime is 16641910477. The reversal of 16641910465 is 56401914661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56401914661 = 29 ⋅1944893609.

It can be written as a sum of positive squares in 2 ways, for example, as 3178253376 + 13463657089 = 56376^2 + 116033^2 .

It is a cyclic number.

It is not a de Polignac number, because 16641910465 - 2⁵ = 16641910433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1664191042 + ... + 1664191051.

It is an arithmetic number, because the mean of its divisors is an integer number (4992573141).

Almost surely, 2^16641910465 is an apocalyptic number.

It is an amenable number.

16641910465 is a deficient number, since it is larger than the sum of its proper divisors (3328382099).

16641910465 is an equidigital number, since it uses as much as digits as its factorization.

16641910465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328382098.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 16641910465 in words is "sixteen billion, six hundred forty-one million, nine hundred ten thousand, four hundred sixty-five".