13635699985 has 16 divisors (see below), whose sum is σ = 16623882000. Its totient is φ = 10735877376.

The previous prime is 13635699977. The next prime is 13635699989. The reversal of 13635699985 is 58999653631.

It is a Cunningham number, because it is equal to 116772²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 730512784 + 12905187201 = 27028^2 + 113601^2 .

It is a cyclic number.

It is not a de Polignac number, because 13635699985 - 2³ = 13635699977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13635699989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2754 + ... + 165163.

It is an arithmetic number, because the mean of its divisors is an integer number (1038992625).

Almost surely, 2^13635699985 is an apocalyptic number.

It is an amenable number.

13635699985 is a deficient number, since it is larger than the sum of its proper divisors (2988182015).

13635699985 is a wasteful number, since it uses less digits than its factorization.

13635699985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168180.

The product of its digits is 47239200, while the sum is 64.

The spelling of 13635699985 in words is "thirteen billion, six hundred thirty-five million, six hundred ninety-nine thousand, nine hundred eighty-five".