525978171797796 has 135 divisors (see below), whose sum is σ = 1404940671869889. Its totient is φ = 171589385778912.

The previous prime is 525978171797791. The next prime is 525978171797801. The reversal of 525978171797796 is 697797171879525.

It is a happy number.

The square root of 525978171797796 is 22934214.

It is a perfect power (a square), and thus also a powerful number.

525978171797796 is a `hidden beast` number, since 5 + 2 + 597 + 8 + 1 + 7 + 1 + 7 + 9 + 7 + 7 + 9 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (525978171797791) and next prime (525978171797801).

It can be written as a sum of positive squares in only one way, i.e., 159771774087396 + 366206397710400 = 12640086^2 + 19136520^2 .

It is not an unprimeable number, because it can be changed into a prime (525978171797791) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 19402331490 + ... + 19402358598.

Almost surely, 2^{525978171797796} is an apocalyptic number.

525978171797796 is the 22934214-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525978171797796

525978171797796 is an abundant number, since it is smaller than the sum of its proper divisors (878962500072093).

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

525978171797796 is an frugal number, since it uses more digits than its factorization.

525978171797796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54328 (or 27161 counting only the distinct ones).

The product of its digits is 29405527200, while the sum is 90.

The spelling of 525978171797796 in words is "five hundred twenty-five trillion, nine hundred seventy-eight billion, one hundred seventy-one million, seven hundred ninety-seven thousand, seven hundred ninety-six".