22494351581 has 4 divisors (see below), whose sum is σ = 24224686332. Its totient is φ = 20764016832.

The previous prime is 22494351577. The next prime is 22494351611. The reversal of 22494351581 is 18515349422.

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 5004289081 + 17490062500 = 70741^2 + 132250^2 .

It is not a de Polignac number, because 22494351581 - 2² = 22494351577 is a prime.

It is a super-2 number, since 2×22494351581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22494351571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865167356 + ... + 865167381.

It is an arithmetic number, because the mean of its divisors is an integer number (6056171583).

Almost surely, 2^22494351581 is an apocalyptic number.

It is an amenable number.

22494351581 is a deficient number, since it is larger than the sum of its proper divisors (1730334751).

22494351581 is a wasteful number, since it uses less digits than its factorization.

22494351581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730334750.

The product of its digits is 345600, while the sum is 44.

The spelling of 22494351581 in words is "twenty-two billion, four hundred ninety-four million, three hundred fifty-one thousand, five hundred eighty-one".