864365857864 has 8 divisors (see below), whose sum is σ = 1620685983510. Its totient is φ = 432182928928.

The previous prime is 864365857847. The next prime is 864365857877. The reversal of 864365857864 is 468758563468.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 449513929764 + 414851928100 = 670458^2 + 644090^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 864365857793 and 864365857802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54022866109 + ... + 54022866124.

Almost surely, 2^864365857864 is an apocalyptic number.

It is an amenable number.

864365857864 is a deficient number, since it is larger than the sum of its proper divisors (756320125646).

864365857864 is a wasteful number, since it uses less digits than its factorization.

864365857864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108045732239 (or 108045732235 counting only the distinct ones).

The product of its digits is 928972800, while the sum is 70.

The spelling of 864365857864 in words is "eight hundred sixty-four billion, three hundred sixty-five million, eight hundred fifty-seven thousand, eight hundred sixty-four".