12733661 has 4 divisors (see below), whose sum is σ = 13077852. Its totient is φ = 12389472.

The previous prime is 12733627. The next prime is 12733673. The reversal of 12733661 is 16633721.

12733661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9424900 + 3308761 = 3070^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 12733661 - 2⁶ = 12733597 is a prime.

It is a super-2 number, since 2×12733661² = 324292244925842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12733691) 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, 172040 + ... + 172113.

It is an arithmetic number, because the mean of its divisors is an integer number (3269463).

Almost surely, 2^12733661 is an apocalyptic number.

It is an amenable number.

12733661 is a deficient number, since it is larger than the sum of its proper divisors (344191).

12733661 is an equidigital number, since it uses as much as digits as its factorization.

12733661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344190.

The product of its digits is 4536, while the sum is 29.

The square root of 12733661 is about 3568.4255631861. The cubic root of 12733661 is about 233.5166013688.

The spelling of 12733661 in words is "twelve million, seven hundred thirty-three thousand, six hundred sixty-one".