66707475 has 24 divisors (see below), whose sum is σ = 115087872. Its totient is φ = 34029600.

The previous prime is 66707467. The next prime is 66707477. The reversal of 66707475 is 57470766.

It is not a de Polignac number, because 66707475 - 2³ = 66707467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66707477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17611 + ... + 21060.

It is an arithmetic number, because the mean of its divisors is an integer number (4795328).

Almost surely, 2^66707475 is an apocalyptic number.

66707475 is a deficient number, since it is larger than the sum of its proper divisors (48380397).

66707475 is a wasteful number, since it uses less digits than its factorization.

66707475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38707 (or 38702 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 42.

The square root of 66707475 is about 8167.4644168187. The cubic root of 66707475 is about 405.5628510048.

The spelling of 66707475 in words is "sixty-six million, seven hundred seven thousand, four hundred seventy-five".