861668383 has 2 divisors, whose sum is σ = 861668384. Its totient is φ = 861668382.

The previous prime is 861668377. The next prime is 861668429. The reversal of 861668383 is 383866168.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861668383 - 2⁹ = 861667871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861668303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430834191 + 430834192.

It is an arithmetic number, because the mean of its divisors is an integer number (430834192).

Almost surely, 2^861668383 is an apocalyptic number.

861668383 is a deficient number, since it is larger than the sum of its proper divisors (1).

861668383 is an equidigital number, since it uses as much as digits as its factorization.

861668383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The square root of 861668383 is about 29354.1885086268. The cubic root of 861668383 is about 951.5830974587.

It can be divided in two parts, 86166 and 8383, that added together give a palindrome (94549).

The spelling of 861668383 in words is "eight hundred sixty-one million, six hundred sixty-eight thousand, three hundred eighty-three".