13061866 has 4 divisors (see below), whose sum is σ = 19592802. Its totient is φ = 6530932.

The previous prime is 13061857. The next prime is 13061891. The reversal of 13061866 is 66816031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 5193841 = 2805^2 + 2279^2 .

It is a super-2 number, since 2×13061866² = 341224686803912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265465 + ... + 3265468.

Almost surely, 2^13061866 is an apocalyptic number.

13061866 is a deficient number, since it is larger than the sum of its proper divisors (6530936).

13061866 is an equidigital number, since it uses as much as digits as its factorization.

13061866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6530935.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 13061866 is about 3614.1203632419. The cubic root of 13061866 is about 235.5058726784.

Adding to 13061866 its reverse (66816031), we get a palindrome (79877897).

The spelling of 13061866 in words is "thirteen million, sixty-one thousand, eight hundred sixty-six".