66650501 has 2 divisors, whose sum is σ = 66650502. Its totient is φ = 66650500.

The previous prime is 66650477. The next prime is 66650509. The reversal of 66650501 is 10505666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36893476 + 29757025 = 6074^2 + 5455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66650501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66650509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33325250 + 33325251.

It is an arithmetic number, because the mean of its divisors is an integer number (33325251).

Almost surely, 2^66650501 is an apocalyptic number.

It is an amenable number.

66650501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66650501 is an equidigital number, since it uses as much as digits as its factorization.

66650501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66650501 is about 8163.9758083914. The cubic root of 66650501 is about 405.4473561054.

The spelling of 66650501 in words is "sixty-six million, six hundred fifty thousand, five hundred one".