861921917286 has 16 divisors (see below), whose sum is σ = 1724080162224. Its totient is φ = 287267917824.

The previous prime is 861921917281. The next prime is 861921917309. The reversal of 861921917286 is 682719129168.

861921917286 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861921917281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9799555 + ... + 9887118.

It is an arithmetic number, because the mean of its divisors is an integer number (107755010139).

Almost surely, 2^861921917286 is an apocalyptic number.

861921917286 is an abundant number, since it is smaller than the sum of its proper divisors (862158244938).

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

861921917286 is a wasteful number, since it uses less digits than its factorization.

861921917286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19693975.

The product of its digits is 5225472, while the sum is 60.

The spelling of 861921917286 in words is "eight hundred sixty-one billion, nine hundred twenty-one million, nine hundred seventeen thousand, two hundred eighty-six".