861872225658 has 16 divisors (see below), whose sum is σ = 1727040336096. Its totient is φ = 286741427760.

The previous prime is 861872225657. The next prime is 861872225659. The reversal of 861872225658 is 856522278168.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (861872225657) and next prime (861872225659).

It is not an unprimeable number, because it can be changed into a prime (861872225657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137325133 + ... + 137331408.

It is an arithmetic number, because the mean of its divisors is an integer number (107940021006).

Almost surely, 2^861872225658 is an apocalyptic number.

861872225658 is an abundant number, since it is smaller than the sum of its proper divisors (865168110438).

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

861872225658 is a wasteful number, since it uses less digits than its factorization.

861872225658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274657069.

The product of its digits is 25804800, while the sum is 60.

The spelling of 861872225658 in words is "eight hundred sixty-one billion, eight hundred seventy-two million, two hundred twenty-five thousand, six hundred fifty-eight".