66635255253667 has 4 divisors (see below), whose sum is σ = 69532440264720. Its totient is φ = 63738070242616.

The previous prime is 66635255253661. The next prime is 66635255253673. The reversal of 66635255253667 is 76635255253666.

66635255253667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66635255253661) and next prime (66635255253673).

It is a cyclic number.

It is not a de Polignac number, because 66635255253667 - 2²⁷ = 66635121035939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66635255253661) 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 3 ways as a sum of consecutive naturals, for example, 1448592505492 + ... + 1448592505537.

It is an arithmetic number, because the mean of its divisors is an integer number (17383110066180).

Almost surely, 2^{66635255253667} is an apocalyptic number.

66635255253667 is a deficient number, since it is larger than the sum of its proper divisors (2897185011053).

66635255253667 is a wasteful number, since it uses less digits than its factorization.

66635255253667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897185011052.

The product of its digits is 1224720000, while the sum is 67.

Subtracting 66635255253667 from its reverse (76635255253666), we obtain a palindrome (9999999999999).

The spelling of 66635255253667 in words is "sixty-six trillion, six hundred thirty-five billion, two hundred fifty-five million, two hundred fifty-three thousand, six hundred sixty-seven".