808665102861 has 32 divisors (see below), whose sum is σ = 1345179045888. Its totient is φ = 419803083840.

The previous prime is 808665102853. The next prime is 808665102893. The reversal of 808665102861 is 168201566808.

It is a happy number.

It is not a de Polignac number, because 808665102861 - 2³ = 808665102853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808665102811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 833610 + ... + 1520603.

It is an arithmetic number, because the mean of its divisors is an integer number (42036845184).

Almost surely, 2^808665102861 is an apocalyptic number.

It is an amenable number.

808665102861 is a deficient number, since it is larger than the sum of its proper divisors (536513943027).

808665102861 is a wasteful number, since it uses less digits than its factorization.

808665102861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355721.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 808665102861 in words is "eight hundred eight billion, six hundred sixty-five million, one hundred two thousand, eight hundred sixty-one".