865851664095 has 48 divisors (see below), whose sum is σ = 1638169801632. Its totient is φ = 419570196480.

The previous prime is 865851664033. The next prime is 865851664129. The reversal of 865851664095 is 590466158568.

It is a happy number.

865851664095 is a `hidden beast` number, since 8 + 6 + 58 + 516 + 64 + 0 + 9 + 5 = 666.

It is not a de Polignac number, because 865851664095 - 2⁸ = 865851663839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 387439 + ... + 1371791.

It is an arithmetic number, because the mean of its divisors is an integer number (34128537534).

Almost surely, 2^865851664095 is an apocalyptic number.

865851664095 is a deficient number, since it is larger than the sum of its proper divisors (772318137537).

865851664095 is a wasteful number, since it uses less digits than its factorization.

865851664095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986152 (or 986149 counting only the distinct ones).

The product of its (nonzero) digits is 62208000, while the sum is 63.

The spelling of 865851664095 in words is "eight hundred sixty-five billion, eight hundred fifty-one million, six hundred sixty-four thousand, ninety-five".