66669075 has 120 divisors (see below), whose sum is σ = 139897296. Its totient is φ = 31104000.

The previous prime is 66669059. The next prime is 66669089. The reversal of 66669075 is 57096666.

It is not a de Polignac number, because 66669075 - 2⁴ = 66669059 is a prime.

It is a super-2 number, since 2×66669075² = 8889531122711250, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66669075.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 913239 + ... + 913311.

Almost surely, 2^66669075 is an apocalyptic number.

66669075 is an abundant number, since it is smaller than the sum of its proper divisors (73228221).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66669075 is a wasteful number, since it uses less digits than its factorization.

66669075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 66669075 is about 8165.1132876403. The cubic root of 66669075 is about 405.4850156360.

The spelling of 66669075 in words is "sixty-six million, six hundred sixty-nine thousand, seventy-five".