66899811 has 48 divisors (see below), whose sum is σ = 106983072. Its totient is φ = 37002240.

The previous prime is 66899797. The next prime is 66899813. The reversal of 66899811 is 11899866.

It is not a de Polignac number, because 66899811 - 2⁷ = 66899683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66899813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228181 + ... + 228473.

It is an arithmetic number, because the mean of its divisors is an integer number (2228814).

Almost surely, 2^66899811 is an apocalyptic number.

66899811 is a deficient number, since it is larger than the sum of its proper divisors (40083261).

66899811 is a wasteful number, since it uses less digits than its factorization.

66899811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 361 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 66899811 is about 8179.2304650254. The cubic root of 66899811 is about 405.9522600730.

Subtracting from 66899811 its reverse (11899866), we obtain a palindrome (54999945).

The spelling of 66899811 in words is "sixty-six million, eight hundred ninety-nine thousand, eight hundred eleven".