22731506810993 has 4 divisors (see below), whose sum is σ = 22731516532848. Its totient is φ = 22731497089140.

The previous prime is 22731506810941. The next prime is 22731506811017. The reversal of 22731506810993 is 39901860513722.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22731506810993 - 2²⁶ = 22731439702129 is a prime.

It is a super-2 number, since 2×22731506810993² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22731506890993) 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, 1009730 + ... + 6817812.

It is an arithmetic number, because the mean of its divisors is an integer number (5682879133212).

Almost surely, 2^{22731506810993} is an apocalyptic number.

It is an amenable number.

22731506810993 is a deficient number, since it is larger than the sum of its proper divisors (9721855).

22731506810993 is an equidigital number, since it uses as much as digits as its factorization.

22731506810993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9721854.

The product of its (nonzero) digits is 4898880, while the sum is 56.

Adding to 22731506810993 its sum of digits (56), we get a square (22731506811049 = 4767757²).

The spelling of 22731506810993 in words is "twenty-two trillion, seven hundred thirty-one billion, five hundred six million, eight hundred ten thousand, nine hundred ninety-three".