66249099 has 24 divisors (see below), whose sum is σ = 111432672. Its totient is φ = 37140480.

The previous prime is 66249097. The next prime is 66249101. The reversal of 66249099 is 99094266.

It is an interprime number because it is at equal distance from previous prime (66249097) and next prime (66249101).

It is not a de Polignac number, because 66249099 - 2¹ = 66249097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66249091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6582 + ... + 13259.

It is an arithmetic number, because the mean of its divisors is an integer number (4643028).

Almost surely, 2^66249099 is an apocalyptic number.

66249099 is a deficient number, since it is larger than the sum of its proper divisors (45183573).

66249099 is a wasteful number, since it uses less digits than its factorization.

66249099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19907 (or 19904 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 66249099 is about 8139.3549498716. The cubic root of 66249099 is about 404.6317823809.

The spelling of 66249099 in words is "sixty-six million, two hundred forty-nine thousand, ninety-nine".