66753907 has 4 divisors (see below), whose sum is σ = 72822456. Its totient is φ = 60685360.

The previous prime is 66753899. The next prime is 66753949. The reversal of 66753907 is 70935766.

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 66753907 - 2³ = 66753899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66753307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3034258 + ... + 3034279.

It is an arithmetic number, because the mean of its divisors is an integer number (18205614).

Almost surely, 2^66753907 is an apocalyptic number.

66753907 is a deficient number, since it is larger than the sum of its proper divisors (6068549).

66753907 is a wasteful number, since it uses less digits than its factorization.

66753907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6068548.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 66753907 is about 8170.3064202024. The cubic root of 66753907 is about 405.6569270526.

The spelling of 66753907 in words is "sixty-six million, seven hundred fifty-three thousand, nine hundred seven".