66988099 has 6 divisors (see below), whose sum is σ = 67631564. Its totient is φ = 66350700.

The previous prime is 66988067. The next prime is 66988127. The reversal of 66988099 is 99088966.

It is not a de Polignac number, because 66988099 - 2⁵ = 66988067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66988039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8524 + ... + 14374.

Almost surely, 2^66988099 is an apocalyptic number.

66988099 is a deficient number, since it is larger than the sum of its proper divisors (643465).

66988099 is an equidigital number, since it uses as much as digits as its factorization.

66988099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065 (or 5958 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 66988099 is about 8184.6257703086. The cubic root of 66988099 is about 406.1307606186.

The spelling of 66988099 in words is "sixty-six million, nine hundred eighty-eight thousand, ninety-nine".