8216178238925 has 12 divisors (see below), whose sum is σ = 10197247760340. Its totient is φ = 6567015659520.

The previous prime is 8216178238921. The next prime is 8216178238937. The reversal of 8216178238925 is 5298328716128.

It can be written as a sum of positive squares in 6 ways, for example, as 2362304446441 + 5853873792484 = 1536979^2 + 2419478^2 .

It is not a de Polignac number, because 8216178238925 - 2² = 8216178238921 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216178238921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148145012 + ... + 148200461.

It is an arithmetic number, because the mean of its divisors is an integer number (849770646695).

Almost surely, 2^{8216178238925} is an apocalyptic number.

It is an amenable number.

8216178238925 is a deficient number, since it is larger than the sum of its proper divisors (1981069521415).

8216178238925 is a wasteful number, since it uses less digits than its factorization.

8216178238925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296346592 (or 296346587 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 62.

The spelling of 8216178238925 in words is "eight trillion, two hundred sixteen billion, one hundred seventy-eight million, two hundred thirty-eight thousand, nine hundred twenty-five".