68935128025 has 9 divisors (see below), whose sum is σ = 85481186623. Its totient is φ = 55147052200.

The previous prime is 68935128023. The next prime is 68935128113. The reversal of 68935128025 is 52082153986.

It is a happy number.

The square root of 68935128025 is 262555.

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., 24816646089 + 44118481936 = 157533^2 + 210044^2 .

It is not a de Polignac number, because 68935128025 - 2¹ = 68935128023 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 68935128025.

It is not an unprimeable number, because it can be changed into a prime (68935128023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1286520 + ... + 1339030.

Almost surely, 2^68935128025 is an apocalyptic number.

68935128025 is the 262555-th square number.

68935128025 is the 131278-th centered octagonal number.

It is an amenable number.

68935128025 is a deficient number, since it is larger than the sum of its proper divisors (16546058598).

68935128025 is an frugal number, since it uses more digits than its factorization.

68935128025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105032 (or 52516 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

Multiplying 68935128025 by its sum of digits (49), we get a square (3377821273225 = 1837885²).

The spelling of 68935128025 in words is "sixty-eight billion, nine hundred thirty-five million, one hundred twenty-eight thousand, twenty-five".