66514820 has 24 divisors (see below), whose sum is σ = 147033600. Its totient is φ = 25205472.

The previous prime is 66514817. The next prime is 66514831. The reversal of 66514820 is 2841566.

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, 87140 + ... + 87899.

It is an arithmetic number, because the mean of its divisors is an integer number (6126400).

Almost surely, 2^66514820 is an apocalyptic number.

It is an amenable number.

66514820 is an abundant number, since it is smaller than the sum of its proper divisors (80518780).

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

66514820 is a wasteful number, since it uses less digits than its factorization.

66514820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175067 (or 175065 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 66514820 is about 8155.6618370308. The cubic root of 66514820 is about 405.1720449760.

The spelling of 66514820 in words is "sixty-six million, five hundred fourteen thousand, eight hundred twenty".