23421571663 has 4 divisors (see below), whose sum is σ = 26767510480. Its totient is φ = 20075632848.

The previous prime is 23421571637. The next prime is 23421571717. The reversal of 23421571663 is 36617512432.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23421571663 - 2¹³ = 23421563471 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 (23421571603) 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, 1672969398 + ... + 1672969411.

It is an arithmetic number, because the mean of its divisors is an integer number (6691877620).

Almost surely, 2^23421571663 is an apocalyptic number.

23421571663 is a deficient number, since it is larger than the sum of its proper divisors (3345938817).

23421571663 is an equidigital number, since it uses as much as digits as its factorization.

23421571663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345938816.

The product of its digits is 181440, while the sum is 40.

The spelling of 23421571663 in words is "twenty-three billion, four hundred twenty-one million, five hundred seventy-one thousand, six hundred sixty-three".