861851453244 has 48 divisors (see below), whose sum is σ = 2014048923936. Its totient is φ = 286846560000.

The previous prime is 861851453233. The next prime is 861851453251. The reversal of 861851453244 is 442354158168.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 44185494 + ... + 44204994.

It is an arithmetic number, because the mean of its divisors is an integer number (41959352582).

Almost surely, 2^861851453244 is an apocalyptic number.

It is an amenable number.

861851453244 is an abundant number, since it is smaller than the sum of its proper divisors (1152197470692).

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

861851453244 is a wasteful number, since it uses less digits than its factorization.

861851453244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24926 (or 24924 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 51.

The spelling of 861851453244 in words is "eight hundred sixty-one billion, eight hundred fifty-one million, four hundred fifty-three thousand, two hundred forty-four".