861930642563 has 2 divisors, whose sum is σ = 861930642564. Its totient is φ = 861930642562.

The previous prime is 861930642557. The next prime is 861930642691. The reversal of 861930642563 is 365246039168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861930642563 - 2³⁴ = 844750773379 is a prime.

It is not a weakly prime, because it can be changed into another prime (861930642533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430965321281 + 430965321282.

It is an arithmetic number, because the mean of its divisors is an integer number (430965321282).

Almost surely, 2^861930642563 is an apocalyptic number.

861930642563 is a deficient number, since it is larger than the sum of its proper divisors (1).

861930642563 is an equidigital number, since it uses as much as digits as its factorization.

861930642563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 861930642563 in words is "eight hundred sixty-one billion, nine hundred thirty million, six hundred forty-two thousand, five hundred sixty-three".