861686833450 has 24 divisors (see below), whose sum is σ = 1603064456460. Its totient is φ = 344604422400.

The previous prime is 861686833439. The next prime is 861686833451. The reversal of 861686833450 is 54338686168.

It can be written as a sum of positive squares in 6 ways, for example, as 813742913929 + 47943919521 = 902077^2 + 218961^2 .

It is not an unprimeable number, because it can be changed into a prime (861686833451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1509871 + ... + 2000770.

Almost surely, 2^861686833450 is an apocalyptic number.

861686833450 is a deficient number, since it is larger than the sum of its proper divisors (741377623010).

861686833450 is a wasteful number, since it uses less digits than its factorization.

861686833450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3515562 (or 3515557 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 861686833450 in words is "eight hundred sixty-one billion, six hundred eighty-six million, eight hundred thirty-three thousand, four hundred fifty".