66487501 has 2 divisors, whose sum is σ = 66487502. Its totient is φ = 66487500.

The previous prime is 66487489. The next prime is 66487507. The reversal of 66487501 is 10578466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66031876 + 455625 = 8126^2 + 675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66487501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66487507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33243750 + 33243751.

It is an arithmetic number, because the mean of its divisors is an integer number (33243751).

Almost surely, 2^66487501 is an apocalyptic number.

It is an amenable number.

66487501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66487501 is an equidigital number, since it uses as much as digits as its factorization.

66487501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 66487501 is about 8153.9868162758. The cubic root of 66487501 is about 405.1165665585.

The spelling of 66487501 in words is "sixty-six million, four hundred eighty-seven thousand, five hundred one".