66215798 has 24 divisors (see below), whose sum is σ = 114927960. Its totient is φ = 28512000.

The previous prime is 66215777. The next prime is 66215801. The reversal of 66215798 is 89751266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2603 + ... + 11798.

It is an arithmetic number, because the mean of its divisors is an integer number (4788665).

Almost surely, 2^66215798 is an apocalyptic number.

66215798 is a deficient number, since it is larger than the sum of its proper divisors (48712162).

66215798 is a wasteful number, since it uses less digits than its factorization.

66215798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14444 (or 14433 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 66215798 is about 8137.3090146559. The cubic root of 66215798 is about 404.5639731500.

The spelling of 66215798 in words is "sixty-six million, two hundred fifteen thousand, seven hundred ninety-eight".