66956072 has 8 divisors (see below), whose sum is σ = 125542650. Its totient is φ = 33478032.

The previous prime is 66956069. The next prime is 66956107. The reversal of 66956072 is 27065966.

It can be written as a sum of positive squares in only one way, i.e., 44809636 + 22146436 = 6694^2 + 4706^2 .

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, 4184747 + ... + 4184762.

Almost surely, 2^66956072 is an apocalyptic number.

It is an amenable number.

66956072 is a deficient number, since it is larger than the sum of its proper divisors (58586578).

66956072 is a wasteful number, since it uses less digits than its factorization.

66956072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8369515 (or 8369511 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 66956072 is about 8182.6690022266. The cubic root of 66956072 is about 406.0660266160.

The spelling of 66956072 in words is "sixty-six million, nine hundred fifty-six thousand, seventy-two".