66215796 has 24 divisors (see below), whose sum is σ = 154640640. Its totient is φ = 22052352.

The previous prime is 66215777. The next prime is 66215801. The reversal of 66215796 is 69751266.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19540 + ... + 22676.

It is an arithmetic number, because the mean of its divisors is an integer number (6443360).

Almost surely, 2^66215796 is an apocalyptic number.

It is an amenable number.

66215796 is an abundant number, since it is smaller than the sum of its proper divisors (88424844).

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

66215796 is a wasteful number, since it uses less digits than its factorization.

66215796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4903 (or 4901 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 66215796 is about 8137.3088917651. The cubic root of 66215796 is about 404.5639690769.

The spelling of 66215796 in words is "sixty-six million, two hundred fifteen thousand, seven hundred ninety-six".