865332091660 has 48 divisors (see below), whose sum is σ = 1896791097600. Its totient is φ = 330981418944.

The previous prime is 865332091627. The next prime is 865332091667. The reversal of 865332091660 is 66190233568.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (865332091667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1210531 + ... + 1787749.

It is an arithmetic number, because the mean of its divisors is an integer number (39516481200).

Almost surely, 2^865332091660 is an apocalyptic number.

It is an amenable number.

865332091660 is an abundant number, since it is smaller than the sum of its proper divisors (1031459005940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865332091660 is a wasteful number, since it uses less digits than its factorization.

865332091660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580510 (or 580508 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 865332091660 in words is "eight hundred sixty-five billion, three hundred thirty-two million, ninety-one thousand, six hundred sixty".