66511325 has 12 divisors (see below), whose sum is σ = 84393408. Its totient is φ = 51970800.

The previous prime is 66511283. The next prime is 66511363. The reversal of 66511325 is 52311566.

It is not a de Polignac number, because 66511325 - 2⁶ = 66511261 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 29861 + ... + 32010.

It is an arithmetic number, because the mean of its divisors is an integer number (7032784).

Almost surely, 2^66511325 is an apocalyptic number.

It is an amenable number.

66511325 is a deficient number, since it is larger than the sum of its proper divisors (17882083).

66511325 is a wasteful number, since it uses less digits than its factorization.

66511325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61924 (or 61919 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 66511325 is about 8155.4475658912. The cubic root of 66511325 is about 405.1649483064.

The spelling of 66511325 in words is "sixty-six million, five hundred eleven thousand, three hundred twenty-five".