861943389950 has 24 divisors (see below), whose sum is σ = 1697521454352. Its totient is φ = 324496334720.

The previous prime is 861943389943. The next prime is 861943389971. The reversal of 861943389950 is 59983349168.

It is a super-2 number, since 2×861943389950² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 507024674 + ... + 507026373.

It is an arithmetic number, because the mean of its divisors is an integer number (70730060598).

Almost surely, 2^861943389950 is an apocalyptic number.

861943389950 is a deficient number, since it is larger than the sum of its proper divisors (835578064402).

861943389950 is a wasteful number, since it uses less digits than its factorization.

861943389950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014051076 (or 1014051071 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 65.

The spelling of 861943389950 in words is "eight hundred sixty-one billion, nine hundred forty-three million, three hundred eighty-nine thousand, nine hundred fifty".