10091877865 has 4 divisors (see below), whose sum is σ = 12110253444. Its totient is φ = 8073502288.

The previous prime is 10091877863. The next prime is 10091877931. The reversal of 10091877865 is 56877819001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56877819001 = 881 ⋅64560521.

It can be written as a sum of positive squares in 2 ways, for example, as 6039154944 + 4052722921 = 77712^2 + 63661^2 .

It is a cyclic number.

It is not a de Polignac number, because 10091877865 - 2¹ = 10091877863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10091877863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1009187782 + ... + 1009187791.

It is an arithmetic number, because the mean of its divisors is an integer number (3027563361).

Almost surely, 2^10091877865 is an apocalyptic number.

It is an amenable number.

10091877865 is a deficient number, since it is larger than the sum of its proper divisors (2018375579).

10091877865 is an equidigital number, since it uses as much as digits as its factorization.

10091877865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018375578.

The product of its (nonzero) digits is 846720, while the sum is 52.

The spelling of 10091877865 in words is "ten billion, ninety-one million, eight hundred seventy-seven thousand, eight hundred sixty-five".