22491870547 has 4 divisors (see below), whose sum is σ = 23267452320. Its totient is φ = 21716288776.

The previous prime is 22491870523. The next prime is 22491870563. The reversal of 22491870547 is 74507819422.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22491870547 - 2¹¹ = 22491868499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22491870547.

It is not an unprimeable number, because it can be changed into a prime (22491870047) 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, 387790843 + ... + 387790900.

It is an arithmetic number, because the mean of its divisors is an integer number (5816863080).

Almost surely, 2^22491870547 is an apocalyptic number.

22491870547 is a deficient number, since it is larger than the sum of its proper divisors (775581773).

22491870547 is an equidigital number, since it uses as much as digits as its factorization.

22491870547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775581772.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 22491870547 in words is "twenty-two billion, four hundred ninety-one million, eight hundred seventy thousand, five hundred forty-seven".