16636426465 has 4 divisors (see below), whose sum is σ = 19963711764. Its totient is φ = 13309141168.

The previous prime is 16636426451. The next prime is 16636426501. The reversal of 16636426465 is 56462463661.

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 1894338576 + 14742087889 = 43524^2 + 121417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16636426465 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663642642 + ... + 1663642651.

It is an arithmetic number, because the mean of its divisors is an integer number (4990927941).

Almost surely, 2^16636426465 is an apocalyptic number.

It is an amenable number.

16636426465 is a deficient number, since it is larger than the sum of its proper divisors (3327285299).

16636426465 is an equidigital number, since it uses as much as digits as its factorization.

16636426465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327285298.

The product of its digits is 3732480, while the sum is 49.

The spelling of 16636426465 in words is "sixteen billion, six hundred thirty-six million, four hundred twenty-six thousand, four hundred sixty-five".