66049999 has 2 divisors, whose sum is σ = 66050000. Its totient is φ = 66049998.

The previous prime is 66049979. The next prime is 66050027. The reversal of 66049999 is 99994066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66049999 - 2¹⁹ = 65525711 is a prime.

66049999 is a modest number, since divided by 9999 gives 6604 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66049939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33024999 + 33025000.

It is an arithmetic number, because the mean of its divisors is an integer number (33025000).

Almost surely, 2^66049999 is an apocalyptic number.

66049999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66049999 is an equidigital number, since it uses as much as digits as its factorization.

66049999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 52.

The square root of 66049999 is about 8127.1150477891. The cubic root of 66049999 is about 404.2260257781.

The spelling of 66049999 in words is "sixty-six million, forty-nine thousand, nine hundred ninety-nine".