13775661 has 24 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 8578176.

The previous prime is 13775647. The next prime is 13775681. The reversal of 13775661 is 16657731.

13775661 is nontrivially palindromic in base 16.

13775661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13775661 - 2⁷ = 13775533 is a prime.

It is a super-4 number, since 4×13775661⁴ (a number of 30 digits) contains 4444 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13775621) 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, 27136 + ... + 27638.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^13775661 is an apocalyptic number.

It is an amenable number.

13775661 is a deficient number, since it is larger than the sum of its proper divisors (7452819).

13775661 is a wasteful number, since it uses less digits than its factorization.

13775661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 702 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 13775661 is about 3711.5577592165. The cubic root of 13775661 is about 239.7199337225.

The spelling of 13775661 in words is "thirteen million, seven hundred seventy-five thousand, six hundred sixty-one".