66080072 has 8 divisors (see below), whose sum is σ = 123900150. Its totient is φ = 33040032.

The previous prime is 66080041. The next prime is 66080093. The reversal of 66080072 is 27008066.

It can be written as a sum of positive squares in only one way, i.e., 43744996 + 22335076 = 6614^2 + 4726^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4129997 + ... + 4130012.

Almost surely, 2^66080072 is an apocalyptic number.

It is an amenable number.

66080072 is a deficient number, since it is larger than the sum of its proper divisors (57820078).

66080072 is a wasteful number, since it uses less digits than its factorization.

66080072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8260015 (or 8260011 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 66080072 is about 8128.9650017699. The cubic root of 66080072 is about 404.2873653945.

The spelling of 66080072 in words is "sixty-six million, eighty thousand, seventy-two".