66825502817633 has 16 divisors (see below), whose sum is σ = 80864906503680. Its totient is φ = 53909360994816.

The previous prime is 66825502817621. The next prime is 66825502817699. The reversal of 66825502817633 is 33671820552866.

It is a happy number.

It is not a de Polignac number, because 66825502817633 - 2⁸ = 66825502817377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66825502817033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22437560 + ... + 25240742.

It is an arithmetic number, because the mean of its divisors is an integer number (5054056656480).

Almost surely, 2^{66825502817633} is an apocalyptic number.

It is an amenable number.

66825502817633 is a deficient number, since it is larger than the sum of its proper divisors (14039403686047).

66825502817633 is a wasteful number, since it uses less digits than its factorization.

66825502817633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003536.

The product of its (nonzero) digits is 87091200, while the sum is 62.

The spelling of 66825502817633 in words is "sixty-six trillion, eight hundred twenty-five billion, five hundred two million, eight hundred seventeen thousand, six hundred thirty-three".