22257639891 has 8 divisors (see below), whose sum is σ = 32974281360. Its totient is φ = 14838426576.

The previous prime is 22257639863. The next prime is 22257639913. The reversal of 22257639891 is 19893675222.

It is not a de Polignac number, because 22257639891 - 2¹³ = 22257631699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22257639841) 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 7 ways as a sum of consecutive naturals, for example, 412178490 + ... + 412178543.

It is an arithmetic number, because the mean of its divisors is an integer number (4121785170).

Almost surely, 2^22257639891 is an apocalyptic number.

22257639891 is a deficient number, since it is larger than the sum of its proper divisors (10716641469).

22257639891 is an equidigital number, since it uses as much as digits as its factorization.

22257639891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824357042 (or 824357036 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 22257639891 in words is "twenty-two billion, two hundred fifty-seven million, six hundred thirty-nine thousand, eight hundred ninety-one".