66820485 has 8 divisors (see below), whose sum is σ = 106912800. Its totient is φ = 35637584.

The previous prime is 66820441. The next prime is 66820513. The reversal of 66820485 is 58402866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66820485 - 2⁷ = 66820357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2227335 + ... + 2227364.

It is an arithmetic number, because the mean of its divisors is an integer number (13364100).

Almost surely, 2^66820485 is an apocalyptic number.

It is an amenable number.

66820485 is a deficient number, since it is larger than the sum of its proper divisors (40092315).

66820485 is a wasteful number, since it uses less digits than its factorization.

66820485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454707.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 66820485 is about 8174.3797929874. The cubic root of 66820485 is about 405.7917448942.

The spelling of 66820485 in words is "sixty-six million, eight hundred twenty thousand, four hundred eighty-five".