225815287698 has 320 divisors, whose sum is σ = 715142292480. Its totient is φ = 51291273600.

The previous prime is 225815287693. The next prime is 225815287739. The reversal of 225815287698 is 896782518522.

225815287698 is a `hidden beast` number, since 2 + 25 + 81 + 528 + 7 + 6 + 9 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (225815287693) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3044433 + ... + 3117723.

It is an arithmetic number, because the mean of its divisors is an integer number (2234819664).

Almost surely, 2^225815287698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225815287698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357571146240).

225815287698 is an abundant number, since it is smaller than the sum of its proper divisors (489327004782).

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

225815287698 is a wasteful number, since it uses less digits than its factorization.

225815287698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73355 (or 73346 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 63.

The spelling of 225815287698 in words is "two hundred twenty-five billion, eight hundred fifteen million, two hundred eighty-seven thousand, six hundred ninety-eight".