23667661 has 4 divisors (see below), whose sum is σ = 23748732. Its totient is φ = 23586592.

The previous prime is 23667653. The next prime is 23667671. The reversal of 23667661 is 16676632.

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 23097636 + 570025 = 4806^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 23667661 - 2³ = 23667653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23667661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23667641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40096 + ... + 40681.

It is an arithmetic number, because the mean of its divisors is an integer number (5937183).

Almost surely, 2^23667661 is an apocalyptic number.

It is an amenable number.

23667661 is a deficient number, since it is larger than the sum of its proper divisors (81071).

23667661 is an equidigital number, since it uses as much as digits as its factorization.

23667661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81070.

The product of its digits is 54432, while the sum is 37.

The square root of 23667661 is about 4864.9420345982. The cubic root of 23667661 is about 287.1122879667.

It can be divided in two parts, 2 and 3667661, that added together give a palindrome (3667663).

The spelling of 23667661 in words is "twenty-three million, six hundred sixty-seven thousand, six hundred sixty-one".