23001578661 has 4 divisors (see below), whose sum is σ = 30668771552. Its totient is φ = 15334385772.

The previous prime is 23001578659. The next prime is 23001578683. The reversal of 23001578661 is 16687510032.

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 not a de Polignac number, because 23001578661 - 2¹ = 23001578659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23001578641) 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, 3833596441 + ... + 3833596446.

It is an arithmetic number, because the mean of its divisors is an integer number (7667192888).

Almost surely, 2^23001578661 is an apocalyptic number.

It is an amenable number.

23001578661 is a deficient number, since it is larger than the sum of its proper divisors (7667192891).

23001578661 is an equidigital number, since it uses as much as digits as its factorization.

23001578661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7667192890.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 23001578661 in words is "twenty-three billion, one million, five hundred seventy-eight thousand, six hundred sixty-one".