23643640451 has 4 divisors (see below), whose sum is σ = 24888042600. Its totient is φ = 22399238304.

The previous prime is 23643640439. The next prime is 23643640453. The reversal of 23643640451 is 15404634632.

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 23643640451 - 2³⁴ = 6463771267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23643640453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622201046 + ... + 622201083.

It is an arithmetic number, because the mean of its divisors is an integer number (6222010650).

Almost surely, 2^23643640451 is an apocalyptic number.

23643640451 is a deficient number, since it is larger than the sum of its proper divisors (1244402149).

23643640451 is a wasteful number, since it uses less digits than its factorization.

23643640451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244402148.

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 23643640451 in words is "twenty-three billion, six hundred forty-three million, six hundred forty thousand, four hundred fifty-one".