23691256993 has 4 divisors (see below), whose sum is σ = 23742648468. Its totient is φ = 23639865520.

The previous prime is 23691256949. The next prime is 23691256999. The reversal of 23691256993 is 39965219632.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11522519649 + 12168737344 = 107343^2 + 110312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23691256993 is a prime.

It is a super-2 number, since 2×23691256993² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23691256999) 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, 25695046 + ... + 25695967.

It is an arithmetic number, because the mean of its divisors is an integer number (5935662117).

Almost surely, 2^23691256993 is an apocalyptic number.

It is an amenable number.

23691256993 is a deficient number, since it is larger than the sum of its proper divisors (51391475).

23691256993 is an equidigital number, since it uses as much as digits as its factorization.

23691256993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51391474.

The product of its digits is 4723920, while the sum is 55.

The spelling of 23691256993 in words is "twenty-three billion, six hundred ninety-one million, two hundred fifty-six thousand, nine hundred ninety-three".