101861371865 has 24 divisors (see below), whose sum is σ = 140733402048. Its totient is φ = 70181984160.

The previous prime is 101861371853. The next prime is 101861371867. The reversal of 101861371865 is 568173168101.

It is not a de Polignac number, because 101861371865 - 2⁸ = 101861371609 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101861371867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2545277 + ... + 2584986.

It is an arithmetic number, because the mean of its divisors is an integer number (5863891752).

Almost surely, 2^101861371865 is an apocalyptic number.

It is an amenable number.

101861371865 is a deficient number, since it is larger than the sum of its proper divisors (38872030183).

101861371865 is a wasteful number, since it uses less digits than its factorization.

101861371865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130317 (or 5130298 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 101861371865 in words is "one hundred one billion, eight hundred sixty-one million, three hundred seventy-one thousand, eight hundred sixty-five".