66964065 has 32 divisors (see below), whose sum is σ = 122757120. Its totient is φ = 30535104.

The previous prime is 66964033. The next prime is 66964067. The reversal of 66964065 is 56046966.

It is not a de Polignac number, because 66964065 - 2⁵ = 66964033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66964067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75052 + ... + 75938.

It is an arithmetic number, because the mean of its divisors is an integer number (3836160).

Almost surely, 2^66964065 is an apocalyptic number.

It is an amenable number.

66964065 is a deficient number, since it is larger than the sum of its proper divisors (55793055).

66964065 is a wasteful number, since it uses less digits than its factorization.

66964065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 66964065 is about 8183.1573979730. The cubic root of 66964065 is about 406.0821842574.

The spelling of 66964065 in words is "sixty-six million, nine hundred sixty-four thousand, sixty-five".