23356778889 has 4 divisors (see below), whose sum is σ = 31142371856. Its totient is φ = 15571185924.

The previous prime is 23356778867. The next prime is 23356778899. The reversal of 23356778889 is 98887765332.

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.

It is not a de Polignac number, because 23356778889 - 2³¹ = 21209295241 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (23356778899) 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, 3892796479 + ... + 3892796484.

It is an arithmetic number, because the mean of its divisors is an integer number (7785592964).

Almost surely, 2^23356778889 is an apocalyptic number.

It is an amenable number.

23356778889 is a deficient number, since it is larger than the sum of its proper divisors (7785592967).

23356778889 is an equidigital number, since it uses as much as digits as its factorization.

23356778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7785592966.

The product of its digits is 121927680, while the sum is 66.

The spelling of 23356778889 in words is "twenty-three billion, three hundred fifty-six million, seven hundred seventy-eight thousand, eight hundred eighty-nine".