66825826 has 4 divisors (see below), whose sum is σ = 100238742. Its totient is φ = 33412912.

The previous prime is 66825821. The next prime is 66825877. The reversal of 66825826 is 62852866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 44876601 + 21949225 = 6699^2 + 4685^2 .

It is a super-3 number, since 3×66825826³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66825821) 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 as a sum of consecutive naturals, namely, 16706455 + ... + 16706458.

Almost surely, 2^66825826 is an apocalyptic number.

66825826 is a deficient number, since it is larger than the sum of its proper divisors (33412916).

66825826 is a wasteful number, since it uses less digits than its factorization.

66825826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33412915.

The product of its digits is 276480, while the sum is 43.

The square root of 66825826 is about 8174.7064779110. The cubic root of 66825826 is about 405.8025563291.

The spelling of 66825826 in words is "sixty-six million, eight hundred twenty-five thousand, eight hundred twenty-six".