66099538 has 8 divisors (see below), whose sum is σ = 101829132. Its totient is φ = 32156496.

The previous prime is 66099521. The next prime is 66099541. The reversal of 66099538 is 83599066.

66099538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 61575409 + 4524129 = 7847^2 + 2127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446545 + ... + 446692.

Almost surely, 2^66099538 is an apocalyptic number.

66099538 is a deficient number, since it is larger than the sum of its proper divisors (35729594).

66099538 is a wasteful number, since it uses less digits than its factorization.

66099538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893276.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 66099538 is about 8130.1622370036. The cubic root of 66099538 is about 404.3270600910.

The spelling of 66099538 in words is "sixty-six million, ninety-nine thousand, five hundred thirty-eight".