66101065 has 4 divisors (see below), whose sum is σ = 79321284. Its totient is φ = 52880848.

The previous prime is 66101059. The next prime is 66101107. The reversal of 66101065 is 56010166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45643536 + 20457529 = 6756^2 + 4523^2 .

It is a cyclic number.

It is not a de Polignac number, because 66101065 - 2¹⁷ = 65969993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6610102 + ... + 6610111.

It is an arithmetic number, because the mean of its divisors is an integer number (19830321).

Almost surely, 2^66101065 is an apocalyptic number.

It is an amenable number.

66101065 is a deficient number, since it is larger than the sum of its proper divisors (13220219).

66101065 is a wasteful number, since it uses less digits than its factorization.

66101065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220218.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66101065 is about 8130.2561460264. The cubic root of 66101065 is about 404.3301735906.

The spelling of 66101065 in words is "sixty-six million, one hundred one thousand, sixty-five".