23663661 has 32 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 13056960.

The previous prime is 23663659. The next prime is 23663671. The reversal of 23663661 is 16636632.

It is a happy number.

It is not a de Polignac number, because 23663661 - 2¹ = 23663659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23663641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87835 + ... + 88103.

It is an arithmetic number, because the mean of its divisors is an integer number (1166400).

Almost surely, 2^23663661 is an apocalyptic number.

23663661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23663661 is a deficient number, since it is larger than the sum of its proper divisors (13661139).

23663661 is a wasteful number, since it uses less digits than its factorization.

23663661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409.

The product of its digits is 23328, while the sum is 33.

The square root of 23663661 is about 4864.5309126369. The cubic root of 23663661 is about 287.0961123948.

It can be divided in two parts, 2 and 3663661, that added together give a palindrome (3663663).

The spelling of 23663661 in words is "twenty-three million, six hundred sixty-three thousand, six hundred sixty-one".