66305725 has 12 divisors (see below), whose sum is σ = 86547040. Its totient is φ = 50252400.

The previous prime is 66305713. The next prime is 66305731. The reversal of 66305725 is 52750366.

It is not a de Polignac number, because 66305725 - 2¹⁹ = 65781437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69321 + ... + 70270.

Almost surely, 2^66305725 is an apocalyptic number.

It is an amenable number.

66305725 is a deficient number, since it is larger than the sum of its proper divisors (20241315).

66305725 is a wasteful number, since it uses less digits than its factorization.

66305725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139620 (or 139615 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 66305725 is about 8142.8327380587. The cubic root of 66305725 is about 404.7470350390.

The spelling of 66305725 in words is "sixty-six million, three hundred five thousand, seven hundred twenty-five".