866507855138862 has 128 divisors (see below), whose sum is σ = 1909299318571008. Its totient is φ = 260980650086400.

The previous prime is 866507855138851. The next prime is 866507855138899. The reversal of 866507855138862 is 268831558705668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 197488188 + ... + 201828144.

It is an arithmetic number, because the mean of its divisors is an integer number (14916400926336).

Almost surely, 2^{866507855138862} is an apocalyptic number.

866507855138862 is an abundant number, since it is smaller than the sum of its proper divisors (1042791463432146).

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

866507855138862 is a wasteful number, since it uses less digits than its factorization.

866507855138862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4340514.

The product of its (nonzero) digits is 4644864000, while the sum is 78.

The spelling of 866507855138862 in words is "eight hundred sixty-six trillion, five hundred seven billion, eight hundred fifty-five million, one hundred thirty-eight thousand, eight hundred sixty-two".