22145997492 has 72 divisors (see below), whose sum is σ = 58024826496. Its totient is φ = 7117064064.

The previous prime is 22145997487. The next prime is 22145997551. The reversal of 22145997492 is 29479954122.

It is a happy number.

22145997492 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 599 + 7 + 49 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15688 + ... + 211040.

It is an arithmetic number, because the mean of its divisors is an integer number (805900368).

Almost surely, 2^22145997492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22145997492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29012413248).

22145997492 is an abundant number, since it is smaller than the sum of its proper divisors (35878829004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22145997492 is a wasteful number, since it uses less digits than its factorization.

22145997492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195477 (or 195472 counting only the distinct ones).

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

The spelling of 22145997492 in words is "twenty-two billion, one hundred forty-five million, nine hundred ninety-seven thousand, four hundred ninety-two".