66740512 has 24 divisors (see below), whose sum is σ = 132565356. Its totient is φ = 33073152.

The previous prime is 66740437. The next prime is 66740519. The reversal of 66740512 is 21504766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64064016 + 2676496 = 8004^2 + 1636^2 .

It is not an unprimeable number, because it can be changed into a prime (66740519) 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, 5613 + ... + 12844.

Almost surely, 2^66740512 is an apocalyptic number.

It is an amenable number.

66740512 is a deficient number, since it is larger than the sum of its proper divisors (65824844).

66740512 is a wasteful number, since it uses less digits than its factorization.

66740512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18580 (or 18572 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 66740512 is about 8169.4866423785. The cubic root of 66740512 is about 405.6297918717.

The spelling of 66740512 in words is "sixty-six million, seven hundred forty thousand, five hundred twelve".