101666065 has 4 divisors (see below), whose sum is σ = 121999284. Its totient is φ = 81332848.

The previous prime is 101666057. The next prime is 101666099. The reversal of 101666065 is 560666101.

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 78712384 + 22953681 = 8872^2 + 4791^2 .

It is a cyclic number.

It is not a de Polignac number, because 101666065 - 2³ = 101666057 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, 10166602 + ... + 10166611.

It is an arithmetic number, because the mean of its divisors is an integer number (30499821).

Almost surely, 2^101666065 is an apocalyptic number.

It is an amenable number.

101666065 is a deficient number, since it is larger than the sum of its proper divisors (20333219).

101666065 is an equidigital number, since it uses as much as digits as its factorization.

101666065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20333218.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 101666065 is about 10082.9591390623. The cubic root of 101666065 is about 466.7224284275.

It can be divided in two parts, 1016 and 66065, that added together give a square (67081 = 259²).

The spelling of 101666065 in words is "one hundred one million, six hundred sixty-six thousand, sixty-five".