66118501 has 2 divisors, whose sum is σ = 66118502. Its totient is φ = 66118500.

The previous prime is 66118489. The next prime is 66118513. The reversal of 66118501 is 10581166.

It is a balanced prime because it is at equal distance from previous prime (66118489) and next prime (66118513).

It can be written as a sum of positive squares in only one way, i.e., 64016001 + 2102500 = 8001^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 66118501 - 2⁷ = 66118373 is a prime.

It is equal to p_3902743 and since 66118501 and 3902743 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66118501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66118541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33059250 + 33059251.

It is an arithmetic number, because the mean of its divisors is an integer number (33059251).

Almost surely, 2^66118501 is an apocalyptic number.

It is an amenable number.

66118501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66118501 is an equidigital number, since it uses as much as digits as its factorization.

66118501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 66118501 is about 8131.3283662634. The cubic root of 66118501 is about 404.3657215864.

Adding to 66118501 its reverse (10581166), we get a palindrome (76699667).

The spelling of 66118501 in words is "sixty-six million, one hundred eighteen thousand, five hundred one".