23845597661 has 4 divisors (see below), whose sum is σ = 24295514652. Its totient is φ = 23395680672.

The previous prime is 23845597649. The next prime is 23845597667. The reversal of 23845597661 is 16679554832.

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 18416118436 + 5429479225 = 135706^2 + 73685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23845597661 is a prime.

It is a super-2 number, since 2×23845597661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23845597597 and 23845597606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23845597667) 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, 224958416 + ... + 224958521.

It is an arithmetic number, because the mean of its divisors is an integer number (6073878663).

Almost surely, 2^23845597661 is an apocalyptic number.

It is an amenable number.

23845597661 is a deficient number, since it is larger than the sum of its proper divisors (449916991).

23845597661 is an equidigital number, since it uses as much as digits as its factorization.

23845597661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449916990.

The product of its digits is 10886400, while the sum is 56.

The spelling of 23845597661 in words is "twenty-three billion, eight hundred forty-five million, five hundred ninety-seven thousand, six hundred sixty-one".