22918691298409 has 3 divisors (see below), whose sum is σ = 22918696085757. Its totient is φ = 22918686511062.

The previous prime is 22918691298359. The next prime is 22918691298473. The reversal of 22918691298409 is 90489219681922.

The square root of 22918691298409 is 4787347.

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 is not a de Polignac number, because 22918691298409 - 2⁷ = 22918691298281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22918691299409) 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, 2393674 + ... + 7181020.

It is an arithmetic number, because the mean of its divisors is an integer number (7639565361919).

Almost surely, 2^{22918691298409} is an apocalyptic number.

22918691298409 is the 4787347-th square number.

22918691298409 is the 2393674-th centered octagonal number.

It is an amenable number.

22918691298409 is a deficient number, since it is larger than the sum of its proper divisors (4787348).

22918691298409 is an frugal number, since it uses more digits than its factorization.

22918691298409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9574694 (or 4787347 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 70.

The spelling of 22918691298409 in words is "twenty-two trillion, nine hundred eighteen billion, six hundred ninety-one million, two hundred ninety-eight thousand, four hundred nine".