66717416 has 8 divisors (see below), whose sum is σ = 125095170. Its totient is φ = 33358704.

The previous prime is 66717397. The next prime is 66717433. The reversal of 66717416 is 61471766.

It can be written as a sum of positive squares in only one way, i.e., 52504516 + 14212900 = 7246^2 + 3770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66717416.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4169831 + ... + 4169846.

Almost surely, 2^66717416 is an apocalyptic number.

It is an amenable number.

66717416 is a deficient number, since it is larger than the sum of its proper divisors (58377754).

66717416 is a wasteful number, since it uses less digits than its factorization.

66717416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8339683 (or 8339679 counting only the distinct ones).

The product of its digits is 42336, while the sum is 38.

The square root of 66717416 is about 8168.0729673528. The cubic root of 66717416 is about 405.5829961736.

The spelling of 66717416 in words is "sixty-six million, seven hundred seventeen thousand, four hundred sixteen".