23644578691 has 2 divisors, whose sum is σ = 23644578692. Its totient is φ = 23644578690.

The previous prime is 23644578649. The next prime is 23644578733. The reversal of 23644578691 is 19687544632.

It is a balanced prime because it is at equal distance from previous prime (23644578649) and next prime (23644578733).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23644578691 is a prime.

It is a super-2 number, since 2×23644578691² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23644578631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11822289345 + 11822289346.

It is an arithmetic number, because the mean of its divisors is an integer number (11822289346).

Almost surely, 2^23644578691 is an apocalyptic number.

23644578691 is a deficient number, since it is larger than the sum of its proper divisors (1).

23644578691 is an equidigital number, since it uses as much as digits as its factorization.

23644578691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 55.

The spelling of 23644578691 in words is "twenty-three billion, six hundred forty-four million, five hundred seventy-eight thousand, six hundred ninety-one".