23653661 has 4 divisors (see below), whose sum is σ = 23665152. Its totient is φ = 23642172.

The previous prime is 23653649. The next prime is 23653667. The reversal of 23653661 is 16635632.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23653661 - 2¹⁰ = 23652637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23653667) 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, 1715 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (5916288).

Almost surely, 2^23653661 is an apocalyptic number.

It is an amenable number.

23653661 is a deficient number, since it is larger than the sum of its proper divisors (11491).

23653661 is an equidigital number, since it uses as much as digits as its factorization.

23653661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11490.

The product of its digits is 19440, while the sum is 32.

The square root of 23653661 is about 4863.5029556894. The cubic root of 23653661 is about 287.0556654886.

The spelling of 23653661 in words is "twenty-three million, six hundred fifty-three thousand, six hundred sixty-one".