861892663 has 2 divisors, whose sum is σ = 861892664. Its totient is φ = 861892662.

The previous prime is 861892583. The next prime is 861892679. The reversal of 861892663 is 366298168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861892663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861812663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430946331 + 430946332.

It is an arithmetic number, because the mean of its divisors is an integer number (430946332).

Almost surely, 2^861892663 is an apocalyptic number.

861892663 is a deficient number, since it is larger than the sum of its proper divisors (1).

861892663 is an equidigital number, since it uses as much as digits as its factorization.

861892663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 861892663 is about 29358.0084985341. The cubic root of 861892663 is about 951.6656514695.

The spelling of 861892663 in words is "eight hundred sixty-one million, eight hundred ninety-two thousand, six hundred sixty-three".