66969875 has 16 divisors (see below), whose sum is σ = 95519424. Its totient is φ = 45921600.

The previous prime is 66969871. The next prime is 66969893. The reversal of 66969875 is 57896966.

It is not a de Polignac number, because 66969875 - 2² = 66969871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66969875.

It is not an unprimeable number, because it can be changed into a prime (66969871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37394 + ... + 39143.

It is an arithmetic number, because the mean of its divisors is an integer number (5969964).

Almost surely, 2^66969875 is an apocalyptic number.

66969875 is a deficient number, since it is larger than the sum of its proper divisors (28549549).

66969875 is an equidigital number, since it uses as much as digits as its factorization.

66969875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76559 (or 76549 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 56.

The square root of 66969875 is about 8183.5123877220. The cubic root of 66969875 is about 406.0939282142.

The spelling of 66969875 in words is "sixty-six million, nine hundred sixty-nine thousand, eight hundred seventy-five".