23066221661 has 4 divisors (see below), whose sum is σ = 26361396192. Its totient is φ = 19771047132.

The previous prime is 23066221643. The next prime is 23066221663. The reversal of 23066221661 is 16612266032.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 23066221661 - 2¹⁴ = 23066205277 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 (23066221663) 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, 1647587255 + ... + 1647587268.

It is an arithmetic number, because the mean of its divisors is an integer number (6590349048).

Almost surely, 2^23066221661 is an apocalyptic number.

It is an amenable number.

23066221661 is a deficient number, since it is larger than the sum of its proper divisors (3295174531).

23066221661 is an equidigital number, since it uses as much as digits as its factorization.

23066221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295174530.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 23066221661 its reverse (16612266032), we get a palindrome (39678487693).

The spelling of 23066221661 in words is "twenty-three billion, sixty-six million, two hundred twenty-one thousand, six hundred sixty-one".