66512416 has 12 divisors (see below), whose sum is σ = 130946382. Its totient is φ = 33256192.

The previous prime is 66512393. The next prime is 66512431. The reversal of 66512416 is 61421566.

It can be written as a sum of positive squares in only one way, i.e., 40908816 + 25603600 = 6396^2 + 5060^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039225 + ... + 1039288.

Almost surely, 2^66512416 is an apocalyptic number.

It is an amenable number.

66512416 is a deficient number, since it is larger than the sum of its proper divisors (64433966).

66512416 is a wasteful number, since it uses less digits than its factorization.

66512416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078523 (or 2078515 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 66512416 is about 8155.5144534235. The cubic root of 66512416 is about 405.1671636311.

The spelling of 66512416 in words is "sixty-six million, five hundred twelve thousand, four hundred sixteen".