66665316 has 48 divisors (see below), whose sum is σ = 167932800. Its totient is φ = 20520192.

The previous prime is 66665311. The next prime is 66665321. The reversal of 66665316 is 61356666.

It is an interprime number because it is at equal distance from previous prime (66665311) and next prime (66665321).

It is not an unprimeable number, because it can be changed into a prime (66665311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3840 + ... + 12168.

It is an arithmetic number, because the mean of its divisors is an integer number (3498600).

Almost surely, 2^66665316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66665316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83966400).

66665316 is an abundant number, since it is smaller than the sum of its proper divisors (101267484).

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

66665316 is a wasteful number, since it uses less digits than its factorization.

66665316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8388 (or 8386 counting only the distinct ones).

The product of its digits is 116640, while the sum is 39.

The square root of 66665316 is about 8164.8830977547. The cubic root of 66665316 is about 405.4773946772.

The spelling of 66665316 in words is "sixty-six million, six hundred sixty-five thousand, three hundred sixteen".