66729375 has 30 divisors (see below), whose sum is σ = 120455192. Its totient is φ = 35586000.

The previous prime is 66729367. The next prime is 66729379. The reversal of 66729375 is 57392766.

It is not a de Polignac number, because 66729375 - 2³ = 66729367 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66729375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66729379) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 307 + ... + 11556.

Almost surely, 2^66729375 is an apocalyptic number.

66729375 is a deficient number, since it is larger than the sum of its proper divisors (53725817).

66729375 is a wasteful number, since it uses less digits than its factorization.

66729375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11889 (or 11871 counting only the distinct ones).

The product of its digits is 476280, while the sum is 45.

The square root of 66729375 is about 8168.8049921638. The cubic root of 66729375 is about 405.6072281137.

The spelling of 66729375 in words is "sixty-six million, seven hundred twenty-nine thousand, three hundred seventy-five".