66601499 has 2 divisors, whose sum is σ = 66601500. Its totient is φ = 66601498.

The previous prime is 66601471. The next prime is 66601511. The reversal of 66601499 is 99410666.

66601499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66601499 is a prime.

It is not a weakly prime, because it can be changed into another prime (66606499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300749 + 33300750.

It is an arithmetic number, because the mean of its divisors is an integer number (33300750).

Almost surely, 2^66601499 is an apocalyptic number.

66601499 is a deficient number, since it is larger than the sum of its proper divisors (1).

66601499 is an equidigital number, since it uses as much as digits as its factorization.

66601499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 66601499 is about 8160.9741452844. The cubic root of 66601499 is about 405.3479689940.

It can be divided in two parts, 666014 and 99, that multiplied together give a triangular number (65935386 = T₁₁₄₈₃).

The spelling of 66601499 in words is "sixty-six million, six hundred one thousand, four hundred ninety-nine".