66439316 has 24 divisors (see below), whose sum is σ = 119992320. Its totient is φ = 32172192.

The previous prime is 66439297. The next prime is 66439337. The reversal of 66439316 is 61393466.

It is a self number, because there is not a number n which added to its sum of digits gives 66439316.

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, 14765 + ... + 18731.

It is an arithmetic number, because the mean of its divisors is an integer number (4999680).

Almost surely, 2^66439316 is an apocalyptic number.

It is an amenable number.

66439316 is a deficient number, since it is larger than the sum of its proper divisors (53553004).

66439316 is a wasteful number, since it uses less digits than its factorization.

66439316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103 (or 4101 counting only the distinct ones).

The product of its digits is 69984, while the sum is 38.

The square root of 66439316 is about 8151.0315911546. The cubic root of 66439316 is about 405.0186771857.

It can be divided in two parts, 66439 and 316, that multiplied together give a square (20994724 = 4582²).

The spelling of 66439316 in words is "sixty-six million, four hundred thirty-nine thousand, three hundred sixteen".