66807065 has 16 divisors (see below), whose sum is σ = 90091008. Its totient is φ = 47188416.

The previous prime is 66807047. The next prime is 66807067. The reversal of 66807065 is 56070866.

It is a cyclic number.

It is not a de Polignac number, because 66807065 - 2⁸ = 66806809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66807067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20849 + ... + 23838.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^66807065 is an apocalyptic number.

66807065 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66807065 is a deficient number, since it is larger than the sum of its proper divisors (23283943).

66807065 is a wasteful number, since it uses less digits than its factorization.

66807065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44728.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 66807065 is about 8173.5588943862. The cubic root of 66807065 is about 405.7645771286.

The spelling of 66807065 in words is "sixty-six million, eight hundred seven thousand, sixty-five".