66499398 has 48 divisors (see below), whose sum is σ = 165144096. Its totient is φ = 18944640.

The previous prime is 66499379. The next prime is 66499403. The reversal of 66499398 is 89399466.

It is a happy number.

66499398 is a `hidden beast` number, since 66 + 499 + 3 + 98 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65140 + ... + 66152.

It is an arithmetic number, because the mean of its divisors is an integer number (3440502).

Almost surely, 2^66499398 is an apocalyptic number.

66499398 is an abundant number, since it is smaller than the sum of its proper divisors (98644698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66499398 is a wasteful number, since it uses less digits than its factorization.

66499398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549 (or 1546 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 66499398 is about 8154.7163040783. The cubic root of 66499398 is about 405.1407284149.

The spelling of 66499398 in words is "sixty-six million, four hundred ninety-nine thousand, three hundred ninety-eight".