16636774325 has 12 divisors (see below), whose sum is σ = 20631725988. Its totient is φ = 13308048000.

The previous prime is 16636774291. The next prime is 16636774327. The reversal of 16636774325 is 52347763661.

It can be written as a sum of positive squares in 6 ways, for example, as 1172857009 + 15463917316 = 34247^2 + 124354^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16636774325 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 (16636774327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264089 + ... + 320961.

It is an arithmetic number, because the mean of its divisors is an integer number (1719310499).

Almost surely, 2^16636774325 is an apocalyptic number.

It is an amenable number.

16636774325 is a deficient number, since it is larger than the sum of its proper divisors (3994951663).

16636774325 is a wasteful number, since it uses less digits than its factorization.

16636774325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68584 (or 68579 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 50.

The spelling of 16636774325 in words is "sixteen billion, six hundred thirty-six million, seven hundred seventy-four thousand, three hundred twenty-five".