22154894497 has 4 divisors (see below), whose sum is σ = 22155354756. Its totient is φ = 22154434240.

The previous prime is 22154894471. The next prime is 22154894561. The reversal of 22154894497 is 79449845122.

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 17268325281 + 4886569216 = 131409^2 + 69904^2 .

It is a cyclic number.

It is not a de Polignac number, because 22154894497 - 2⁷ = 22154894369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22154894467) 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, 148204 + ... + 257437.

It is an arithmetic number, because the mean of its divisors is an integer number (5538838689).

Almost surely, 2^22154894497 is an apocalyptic number.

It is an amenable number.

22154894497 is a deficient number, since it is larger than the sum of its proper divisors (460259).

22154894497 is an equidigital number, since it uses as much as digits as its factorization.

22154894497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460258.

The product of its digits is 5806080, while the sum is 55.

The spelling of 22154894497 in words is "twenty-two billion, one hundred fifty-four million, eight hundred ninety-four thousand, four hundred ninety-seven".