66071216 has 20 divisors (see below), whose sum is σ = 129212712. Its totient is φ = 32726016.

The previous prime is 66071191. The next prime is 66071267. The reversal of 66071216 is 61217066.

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, 17585 + ... + 21008.

Almost surely, 2^66071216 is an apocalyptic number.

It is an amenable number.

66071216 is a deficient number, since it is larger than the sum of its proper divisors (63141496).

66071216 is a wasteful number, since it uses less digits than its factorization.

66071216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38708 (or 38702 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 66071216 is about 8128.4202647255. The cubic root of 66071216 is about 404.2693038279.

The spelling of 66071216 in words is "sixty-six million, seventy-one thousand, two hundred sixteen".