66822505 has 4 divisors (see below), whose sum is σ = 80187012. Its totient is φ = 53458000.

The previous prime is 66822499. The next prime is 66822523. The reversal of 66822505 is 50522866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50522866 = 2 ⋅25261433.

It can be written as a sum of positive squares in 2 ways, for example, as 52359696 + 14462809 = 7236^2 + 3803^2 .

It is not a de Polignac number, because 66822505 - 2⁷ = 66822377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6682246 + ... + 6682255.

It is an arithmetic number, because the mean of its divisors is an integer number (20046753).

Almost surely, 2^66822505 is an apocalyptic number.

It is an amenable number.

66822505 is a deficient number, since it is larger than the sum of its proper divisors (13364507).

66822505 is a wasteful number, since it uses less digits than its factorization.

66822505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13364506.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 66822505 is about 8174.5033488280. The cubic root of 66822505 is about 405.7958339150.

The spelling of 66822505 in words is "sixty-six million, eight hundred twenty-two thousand, five hundred five".