66916885 has 8 divisors (see below), whose sum is σ = 91771776. Its totient is φ = 45885840.

The previous prime is 66916877. The next prime is 66916903. The reversal of 66916885 is 58861966.

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

It is not a de Polignac number, because 66916885 - 2³ = 66916877 is a prime.

It is a Duffinian number.

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, 955921 + ... + 955990.

It is an arithmetic number, because the mean of its divisors is an integer number (11471472).

Almost surely, 2^66916885 is an apocalyptic number.

It is an amenable number.

66916885 is a deficient number, since it is larger than the sum of its proper divisors (24854891).

66916885 is a wasteful number, since it uses less digits than its factorization.

66916885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911923.

The product of its digits is 622080, while the sum is 49.

The square root of 66916885 is about 8180.2741396606. The cubic root of 66916885 is about 405.9867925039.

The spelling of 66916885 in words is "sixty-six million, nine hundred sixteen thousand, eight hundred eighty-five".