66165656323525 has 24 divisors (see below), whose sum is σ = 89504491658400. Its totient is φ = 48120260212800.

The previous prime is 66165656323427. The next prime is 66165656323561. The reversal of 66165656323525 is 52532365656166.

It is not a de Polignac number, because 66165656323525 - 2¹⁵ = 66165656290757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84966631 + ... + 85741819.

It is an arithmetic number, because the mean of its divisors is an integer number (3729353819100).

Almost surely, 2^{66165656323525} is an apocalyptic number.

It is an amenable number.

66165656323525 is a deficient number, since it is larger than the sum of its proper divisors (23338835334875).

66165656323525 is a wasteful number, since it uses less digits than its factorization.

66165656323525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085589 (or 1085584 counting only the distinct ones).

The product of its digits is 174960000, while the sum is 61.

The spelling of 66165656323525 in words is "sixty-six trillion, one hundred sixty-five billion, six hundred fifty-six million, three hundred twenty-three thousand, five hundred twenty-five".