66124999 has 2 divisors, whose sum is σ = 66125000. Its totient is φ = 66124998.

The previous prime is 66124991. The next prime is 66125009. The reversal of 66124999 is 99942166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66124999 - 2³ = 66124991 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66124991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33062499 + 33062500.

It is an arithmetic number, because the mean of its divisors is an integer number (33062500).

Almost surely, 2^66124999 is an apocalyptic number.

66124999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66124999 is an equidigital number, since it uses as much as digits as its factorization.

66124999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 66124999 is about 8131.7279221578. The cubic root of 66124999 is about 404.3789679160.

It can be divided in two parts, 6612 and 4999, that added together give a palindrome (11611).

The spelling of 66124999 in words is "sixty-six million, one hundred twenty-four thousand, nine hundred ninety-nine".