66205725 has 24 divisors (see below), whose sum is σ = 111010752. Its totient is φ = 34809600.

The previous prime is 66205723. The next prime is 66205781. The reversal of 66205725 is 52750266.

It is not a de Polignac number, because 66205725 - 2¹ = 66205723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66205721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 892 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (4625448).

Almost surely, 2^66205725 is an apocalyptic number.

It is an amenable number.

66205725 is a deficient number, since it is larger than the sum of its proper divisors (44805027).

66205725 is a wasteful number, since it uses less digits than its factorization.

66205725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12517 (or 12512 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 66205725 is about 8136.6900518577. The cubic root of 66205725 is about 404.5434575043.

The spelling of 66205725 in words is "sixty-six million, two hundred five thousand, seven hundred twenty-five".