66622541 has 16 divisors (see below), whose sum is σ = 73373040. Its totient is φ = 60211200.

The previous prime is 66622511. The next prime is 66622573. The reversal of 66622541 is 14522666.

It can be written as a sum of positive squares in 8 ways, for example, as 9302500 + 57320041 = 3050^2 + 7571^2 .

It is a cyclic number.

It is not a de Polignac number, because 66622541 - 2⁶ = 66622477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66622498 and 66622507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66622511) 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, 165941 + ... + 166341.

It is an arithmetic number, because the mean of its divisors is an integer number (4585815).

Almost surely, 2^66622541 is an apocalyptic number.

It is an amenable number.

66622541 is a deficient number, since it is larger than the sum of its proper divisors (6750499).

66622541 is a wasteful number, since it uses less digits than its factorization.

66622541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784.

The product of its digits is 17280, while the sum is 32.

The square root of 66622541 is about 8162.2632278064. The cubic root of 66622541 is about 405.3906528875.

The spelling of 66622541 in words is "sixty-six million, six hundred twenty-two thousand, five hundred forty-one".