79780827025 has 27 divisors (see below), whose sum is σ = 105121479601. Its totient is φ = 60052192640.

The previous prime is 79780827023. The next prime is 79780827047. The reversal of 79780827025 is 52072808797.

The square root of 79780827025 is 282455.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1866153601 + 77914673424 = 43199^2 + 279132^2 .

It is not a de Polignac number, because 79780827025 - 2¹ = 79780827023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79780827023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 24007014 + ... + 24010336.

Almost surely, 2^79780827025 is an apocalyptic number.

79780827025 is the 282455-th square number.

79780827025 is the 141228-th centered octagonal number.

It is an amenable number.

79780827025 is a deficient number, since it is larger than the sum of its proper divisors (25340652576).

79780827025 is an frugal number, since it uses more digits than its factorization.

79780827025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6690 (or 3345 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 55.

The spelling of 79780827025 in words is "seventy-nine billion, seven hundred eighty million, eight hundred twenty-seven thousand, twenty-five".