66888967 has 4 divisors (see below), whose sum is σ = 67551336. Its totient is φ = 66226600.

The previous prime is 66888961. The next prime is 66888977. The reversal of 66888967 is 76988866.

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

It is a cyclic number.

It is not a de Polignac number, because 66888967 - 2²³ = 58500359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66888961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331033 + ... + 331234.

It is an arithmetic number, because the mean of its divisors is an integer number (16887834).

Almost surely, 2^66888967 is an apocalyptic number.

66888967 is a deficient number, since it is larger than the sum of its proper divisors (662369).

66888967 is a wasteful number, since it uses less digits than its factorization.

66888967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662368.

The product of its digits is 6967296, while the sum is 58.

The square root of 66888967 is about 8178.5675396123. The cubic root of 66888967 is about 405.9303248631.

The spelling of 66888967 in words is "sixty-six million, eight hundred eighty-eight thousand, nine hundred sixty-seven".