66650816 has 28 divisors (see below), whose sum is σ = 136824720. Its totient is φ = 32175360.

The previous prime is 66650783. The next prime is 66650821. The reversal of 66650816 is 61805666.

It is a self number, because there is not a number n which added to its sum of digits gives 66650816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16100 + ... + 19811.

Almost surely, 2^66650816 is an apocalyptic number.

It is an amenable number.

66650816 is an abundant number, since it is smaller than the sum of its proper divisors (70173904).

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

66650816 is a wasteful number, since it uses less digits than its factorization.

66650816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35952 (or 35942 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66650816 is about 8163.9951004395. The cubic root of 66650816 is about 405.4479948389.

The spelling of 66650816 in words is "sixty-six million, six hundred fifty thousand, eight hundred sixteen".