66816902 has 8 divisors (see below), whose sum is σ = 106121016. Its totient is φ = 31443232.

The previous prime is 66816877. The next prime is 66816907. The reversal of 66816902 is 20961866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66816907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982568 + ... + 982635.

It is an arithmetic number, because the mean of its divisors is an integer number (13265127).

Almost surely, 2^66816902 is an apocalyptic number.

66816902 is a deficient number, since it is larger than the sum of its proper divisors (39304114).

66816902 is a wasteful number, since it uses less digits than its factorization.

66816902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965222.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 66816902 is about 8174.1606296916. The cubic root of 66816902 is about 405.7844917402.

The spelling of 66816902 in words is "sixty-six million, eight hundred sixteen thousand, nine hundred two".