66524523625561 has 16 divisors (see below), whose sum is σ = 68449135079808. Its totient is φ = 64614311593600.

The previous prime is 66524523625531. The next prime is 66524523625579. The reversal of 66524523625561 is 16552632542566.

66524523625561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66524523625561 - 2⁵ = 66524523625529 is a prime.

It is a super-2 number, since 2×66524523625561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66524523625496 and 66524523625505.

It is not an unprimeable number, because it can be changed into a prime (66524523625531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461676156 + ... + 461820226.

It is an arithmetic number, because the mean of its divisors is an integer number (4278070942488).

Almost surely, 2^{66524523625561} is an apocalyptic number.

It is an amenable number.

66524523625561 is a deficient number, since it is larger than the sum of its proper divisors (1924611454247).

66524523625561 is a wasteful number, since it uses less digits than its factorization.

66524523625561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193952.

The product of its digits is 77760000, while the sum is 58.

The spelling of 66524523625561 in words is "sixty-six trillion, five hundred twenty-four billion, five hundred twenty-three million, six hundred twenty-five thousand, five hundred sixty-one".