861943336942 has 4 divisors (see below), whose sum is σ = 1292915005416. Its totient is φ = 430971668470.

The previous prime is 861943336853. The next prime is 861943336973. The reversal of 861943336942 is 249633349168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×861943336942² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215485834234 + ... + 215485834237.

It is an arithmetic number, because the mean of its divisors is an integer number (323228751354).

Almost surely, 2^861943336942 is an apocalyptic number.

861943336942 is a deficient number, since it is larger than the sum of its proper divisors (430971668474).

861943336942 is a wasteful number, since it uses less digits than its factorization.

861943336942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430971668473.

The product of its digits is 20155392, while the sum is 58.

The spelling of 861943336942 in words is "eight hundred sixty-one billion, nine hundred forty-three million, three hundred thirty-six thousand, nine hundred forty-two".