66163501 has 2 divisors, whose sum is σ = 66163502. Its totient is φ = 66163500.

The previous prime is 66163499. The next prime is 66163549. The reversal of 66163501 is 10536166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53275401 + 12888100 = 7299^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 66163501 - 2¹ = 66163499 is a prime.

Together with 66163499, it forms a pair of twin primes.

It is equal to p_3905209 and since 66163501 and 3905209 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 66163501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66163001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33081750 + 33081751.

It is an arithmetic number, because the mean of its divisors is an integer number (33081751).

Almost surely, 2^66163501 is an apocalyptic number.

It is an amenable number.

66163501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66163501 is an equidigital number, since it uses as much as digits as its factorization.

66163501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 66163501 is about 8134.0949711692. The cubic root of 66163501 is about 404.4574373725.

Adding to 66163501 its reverse (10536166), we get a palindrome (76699667).

The spelling of 66163501 in words is "sixty-six million, one hundred sixty-three thousand, five hundred one".