13610535661 has 4 divisors (see below), whose sum is σ = 13610970652. Its totient is φ = 13610100672.

The previous prime is 13610535649. The next prime is 13610535691. The reversal of 13610535661 is 16653501631.

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 9023860036 + 4586675625 = 94994^2 + 67725^2 .

It is a cyclic number.

It is not a de Polignac number, because 13610535661 - 2⁵ = 13610535629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13610535661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13610535691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166590 + ... + 234463.

It is an arithmetic number, because the mean of its divisors is an integer number (3402742663).

Almost surely, 2^13610535661 is an apocalyptic number.

It is an amenable number.

13610535661 is a deficient number, since it is larger than the sum of its proper divisors (434991).

13610535661 is an equidigital number, since it uses as much as digits as its factorization.

13610535661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434990.

The product of its (nonzero) digits is 48600, while the sum is 37.

The spelling of 13610535661 in words is "thirteen billion, six hundred ten million, five hundred thirty-five thousand, six hundred sixty-one".