13613061866 has 16 divisors (see below), whose sum is σ = 20521815048. Its totient is φ = 6772531200.

The previous prime is 13613061857. The next prime is 13613061919. The reversal of 13613061866 is 66816031631.

It can be written as a sum of positive squares in 4 ways, for example, as 12875667841 + 737394025 = 113471^2 + 27155^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357506 + ... + 393746.

Almost surely, 2^13613061866 is an apocalyptic number.

13613061866 is a deficient number, since it is larger than the sum of its proper divisors (6908753182).

13613061866 is a wasteful number, since it uses less digits than its factorization.

13613061866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37177.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 13613061866 in words is "thirteen billion, six hundred thirteen million, sixty-one thousand, eight hundred sixty-six".