23155854074809 has 3 divisors (see below), whose sum is σ = 23155858886863. Its totient is φ = 23155849262756.

The previous prime is 23155854074803. The next prime is 23155854074839. The reversal of 23155854074809 is 90847045855132.

It is a happy number.

The square root of 23155854074809 is 4812053.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5161052522025 + 17994801552784 = 2271795^2 + 4242028^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23155854074809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23155854074803) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2406027 + ... + 7218079.

Almost surely, 2^{23155854074809} is an apocalyptic number.

23155854074809 is the 4812053-rd square number.

23155854074809 is the 2406027-th centered octagonal number.

It is an amenable number.

23155854074809 is a deficient number, since it is larger than the sum of its proper divisors (4812054).

23155854074809 is an frugal number, since it uses more digits than its factorization.

23155854074809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624106 (or 4812053 counting only the distinct ones).

The product of its (nonzero) digits is 48384000, while the sum is 61.

The spelling of 23155854074809 in words is "twenty-three trillion, one hundred fifty-five billion, eight hundred fifty-four million, seventy-four thousand, eight hundred nine".