66249999 has 12 divisors (see below), whose sum is σ = 95862000. Its totient is φ = 44089344.

The previous prime is 66249983. The next prime is 66250027. The reversal of 66249999 is 99994266.

66249999 is a `hidden beast` number, since 6 + 62 + 499 + 99 = 666.

It is not a de Polignac number, because 66249999 - 2⁴ = 66249983 is a prime.

66249999 is a modest number, since divided by 9999 gives 6624 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66249199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754 + ... + 11535.

It is an arithmetic number, because the mean of its divisors is an integer number (7988500).

Almost surely, 2^66249999 is an apocalyptic number.

66249999 is a deficient number, since it is larger than the sum of its proper divisors (29612001).

66249999 is a wasteful number, since it uses less digits than its factorization.

66249999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12894 (or 12891 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 66249999 is about 8139.4102366203. The cubic root of 66249999 is about 404.6336146924.

The spelling of 66249999 in words is "sixty-six million, two hundred forty-nine thousand, nine hundred ninety-nine".