66822541 has 6 divisors (see below), whose sum is σ = 67135470. Its totient is φ = 66510936.

The previous prime is 66822533. The next prime is 66822557. The reversal of 66822541 is 14522866.

It can be written as a sum of positive squares in only one way, i.e., 45616516 + 21206025 = 6754^2 + 4605^2 .

It is not a de Polignac number, because 66822541 - 2³ = 66822533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66822497 and 66822506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66822571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93895 + ... + 94603.

It is an arithmetic number, because the mean of its divisors is an integer number (11189245).

Almost surely, 2^66822541 is an apocalyptic number.

It is an amenable number.

66822541 is a deficient number, since it is larger than the sum of its proper divisors (312929).

66822541 is an frugal number, since it uses more digits than its factorization.

66822541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1016 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 66822541 is about 8174.5055507963. The cubic root of 66822541 is about 405.7959067879.

The spelling of 66822541 in words is "sixty-six million, eight hundred twenty-two thousand, five hundred forty-one".