8681997789529 has 9 divisors (see below), whose sum is σ = 8780909628127. Its totient is φ = 8584187958544.

The previous prime is 8681997789467. The next prime is 8681997789541. The reversal of 8681997789529 is 9259877991868.

It is a happy number.

The square root of 8681997789529 is 2946523.

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

It can be written as a sum of positive squares in only one way, i.e., 1667127715929 + 7014870073600 = 1291173^2 + 2648560^2 .

It is not a de Polignac number, because 8681997789529 - 2⁷ = 8681997789401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8681997789529.

It is not an unprimeable number, because it can be changed into a prime (8681997789589) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 262223994 + ... + 262257100.

Almost surely, 2^{8681997789529} is an apocalyptic number.

8681997789529 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

8681997789529 is the 2946523-rd square number.

8681997789529 is the 1473262-nd centered octagonal number.

It is an amenable number.

8681997789529 is a deficient number, since it is larger than the sum of its proper divisors (98911838598).

8681997789529 is an frugal number, since it uses more digits than its factorization.

8681997789529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66392 (or 33196 counting only the distinct ones).

The product of its digits is 9876142080, while the sum is 88.

The spelling of 8681997789529 in words is "eight trillion, six hundred eighty-one billion, nine hundred ninety-seven million, seven hundred eighty-nine thousand, five hundred twenty-nine".