861021647392 has 48 divisors (see below), whose sum is σ = 1703790728640. Its totient is φ = 428317325568.

The previous prime is 861021647359. The next prime is 861021647401. The reversal of 861021647392 is 293746120168.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6189223 + ... + 6326809.

It is an arithmetic number, because the mean of its divisors is an integer number (35495640180).

Almost surely, 2^861021647392 is an apocalyptic number.

It is an amenable number.

861021647392 is a deficient number, since it is larger than the sum of its proper divisors (842769081248).

861021647392 is a wasteful number, since it uses less digits than its factorization.

861021647392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138593 (or 138585 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 861021647392 in words is "eight hundred sixty-one billion, twenty-one million, six hundred forty-seven thousand, three hundred ninety-two".