13666761 has 24 divisors (see below), whose sum is σ = 20831616. Its totient is φ = 8616960.

The previous prime is 13666729. The next prime is 13666769. The reversal of 13666761 is 16766631.

It is not a de Polignac number, because 13666761 - 2⁵ = 13666729 is a prime.

It is a super-2 number, since 2×13666761² = 373560712462242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13666769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21001 + ... + 21641.

It is an arithmetic number, because the mean of its divisors is an integer number (867984).

Almost surely, 2^13666761 is an apocalyptic number.

It is an amenable number.

13666761 is a deficient number, since it is larger than the sum of its proper divisors (7164855).

13666761 is a wasteful number, since it uses less digits than its factorization.

13666761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 770 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 13666761 is about 3696.8582607398. The cubic root of 13666761 is about 239.0865800939.

The spelling of 13666761 in words is "thirteen million, six hundred sixty-six thousand, seven hundred sixty-one".