101687665 has 4 divisors (see below), whose sum is σ = 122025204. Its totient is φ = 81350128.

The previous prime is 101687617. The next prime is 101687681. The reversal of 101687665 is 566786101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566786101 = 7 ⋅80969443.

It can be written as a sum of positive squares in 2 ways, for example, as 58430736 + 43256929 = 7644^2 + 6577^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101687665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10168762 + ... + 10168771.

It is an arithmetic number, because the mean of its divisors is an integer number (30506301).

Almost surely, 2^101687665 is an apocalyptic number.

It is an amenable number.

101687665 is a deficient number, since it is larger than the sum of its proper divisors (20337539).

101687665 is an equidigital number, since it uses as much as digits as its factorization.

101687665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20337538.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 101687665 is about 10084.0301963054. The cubic root of 101687665 is about 466.7554794119.

The spelling of 101687665 in words is "one hundred one million, six hundred eighty-seven thousand, six hundred sixty-five".