66315380 has 12 divisors (see below), whose sum is σ = 139262340. Its totient is φ = 26526144.

The previous prime is 66315367. The next prime is 66315407. The reversal of 66315380 is 8351366.

It can be written as a sum of positive squares in 2 ways, for example, as 31764496 + 34550884 = 5636^2 + 5878^2 .

It is a super-3 number, since 3×66315380³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657865 + ... + 1657904.

It is an arithmetic number, because the mean of its divisors is an integer number (11605195).

Almost surely, 2^66315380 is an apocalyptic number.

It is an amenable number.

66315380 is an abundant number, since it is smaller than the sum of its proper divisors (72946960).

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

66315380 is a wasteful number, since it uses less digits than its factorization.

66315380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315778 (or 3315776 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 66315380 is about 8143.4255691324. The cubic root of 66315380 is about 404.7666796119.

The spelling of 66315380 in words is "sixty-six million, three hundred fifteen thousand, three hundred eighty".