865542042801 has 12 divisors (see below), whose sum is σ = 1250414055540. Its totient is φ = 576941877600.

The previous prime is 865542042797. The next prime is 865542042809. The reversal of 865542042801 is 108240245568.

865542042801 is a `hidden beast` number, since 8 + 65 + 542 + 0 + 42 + 8 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 557740112400 + 307801930401 = 746820^2 + 554799^2 .

It is not a de Polignac number, because 865542042801 - 2² = 865542042797 is a prime.

It is a super-2 number, since 2×865542042801² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865542042809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7115586 + ... + 7236203.

It is an arithmetic number, because the mean of its divisors is an integer number (104201171295).

Almost surely, 2^865542042801 is an apocalyptic number.

It is an amenable number.

865542042801 is a deficient number, since it is larger than the sum of its proper divisors (384872012739).

865542042801 is a wasteful number, since it uses less digits than its factorization.

865542042801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14358496 (or 14358493 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 865542042801 in words is "eight hundred sixty-five billion, five hundred forty-two million, forty-two thousand, eight hundred one".