868487655492 has 18 divisors (see below), whose sum is σ = 2195343795918. Its totient is φ = 289495885152.

The previous prime is 868487655487. The next prime is 868487655493. The reversal of 868487655492 is 294556784868.

868487655492 is a `hidden beast` number, since 8 + 6 + 8 + 4 + 8 + 76 + 5 + 549 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 848196792576 + 20290862916 = 920976^2 + 142446^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 868487655492.

It is not an unprimeable number, because it can be changed into a prime (868487655493) 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 5 ways as a sum of consecutive naturals, for example, 12062328513 + ... + 12062328584.

Almost surely, 2^868487655492 is an apocalyptic number.

It is an amenable number.

868487655492 is an abundant number, since it is smaller than the sum of its proper divisors (1326856140426).

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

868487655492 is a wasteful number, since it uses less digits than its factorization.

868487655492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24124657107 (or 24124657102 counting only the distinct ones).

The product of its digits is 928972800, while the sum is 72.

The spelling of 868487655492 in words is "eight hundred sixty-eight billion, four hundred eighty-seven million, six hundred fifty-five thousand, four hundred ninety-two".