23604201661 has 4 divisors (see below), whose sum is σ = 23869417500. Its totient is φ = 23338985824.

The previous prime is 23604201653. The next prime is 23604201683. The reversal of 23604201661 is 16610240632.

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 16533073561 + 7071128100 = 128581^2 + 84090^2 .

It is a cyclic number.

It is not a de Polignac number, because 23604201661 - 2³ = 23604201653 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 (23604201631) 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, 132607786 + ... + 132607963.

It is an arithmetic number, because the mean of its divisors is an integer number (5967354375).

Almost surely, 2^23604201661 is an apocalyptic number.

It is an amenable number.

23604201661 is a deficient number, since it is larger than the sum of its proper divisors (265215839).

23604201661 is an equidigital number, since it uses as much as digits as its factorization.

23604201661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265215838.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 23604201661 in words is "twenty-three billion, six hundred four million, two hundred one thousand, six hundred sixty-one".