809915222025 has 192 divisors, whose sum is σ = 1835082547200. Its totient is φ = 341040533760.

The previous prime is 809915222021. The next prime is 809915222033. The reversal of 809915222025 is 520222519908.

It is a happy number.

809915222025 is a `hidden beast` number, since 80 + 9 + 9 + 1 + 522 + 20 + 25 = 666.

It is not a de Polignac number, because 809915222025 - 2² = 809915222021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (809915222021) 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 191 ways as a sum of consecutive naturals, for example, 29408812 + ... + 29436338.

It is an arithmetic number, because the mean of its divisors is an integer number (9557721600).

Almost surely, 2^809915222025 is an apocalyptic number.

It is an amenable number.

809915222025 is an abundant number, since it is smaller than the sum of its proper divisors (1025167325175).

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

809915222025 is a wasteful number, since it uses less digits than its factorization.

809915222025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28045 (or 28034 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 809915222025 in words is "eight hundred nine billion, nine hundred fifteen million, two hundred twenty-two thousand, twenty-five".