64716816025 has 27 divisors (see below), whose sum is σ = 81360078429. Its totient is φ = 51066234720.

The previous prime is 64716816011. The next prime is 64716816029. The reversal of 64716816025 is 52061861746.

The square root of 64716816025 is 254395.

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 37818191961 + 26898624064 = 194469^2 + 164008^2 .

It is not a de Polignac number, because 64716816025 - 2¹⁹ = 64716291737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64716816029) 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, 105573619 + ... + 105574231.

Almost surely, 2^64716816025 is an apocalyptic number.

64716816025 is the 254395-th square number.

64716816025 is the 127198-th centered octagonal number.

It is an amenable number.

64716816025 is a deficient number, since it is larger than the sum of its proper divisors (16643262404).

64716816025 is an frugal number, since it uses more digits than its factorization.

64716816025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 64716816025 in words is "sixty-four billion, seven hundred sixteen million, eight hundred sixteen thousand, twenty-five".