66895099 has 4 divisors (see below), whose sum is σ = 66959800. Its totient is φ = 66830400.

The previous prime is 66895061. The next prime is 66895111. The reversal of 66895099 is 99059866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99059866 = 2 ⋅49529933.

It is a cyclic number.

It is not a de Polignac number, because 66895099 - 2⁹ = 66894587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66805099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30774 + ... + 32875.

It is an arithmetic number, because the mean of its divisors is an integer number (16739950).

Almost surely, 2^66895099 is an apocalyptic number.

66895099 is a deficient number, since it is larger than the sum of its proper divisors (64701).

66895099 is a wasteful number, since it uses less digits than its factorization.

66895099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64700.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 66895099 is about 8178.9424132953. The cubic root of 66895099 is about 405.9427289451.

The spelling of 66895099 in words is "sixty-six million, eight hundred ninety-five thousand, ninety-nine".