867661884493 has 2 divisors, whose sum is σ = 867661884494. Its totient is φ = 867661884492.

The previous prime is 867661884451. The next prime is 867661884611. The reversal of 867661884493 is 394488166768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684124185924 + 183537698569 = 827118^2 + 428413^2 .

It is a cyclic number.

It is not a de Polignac number, because 867661884493 - 2³⁷ = 730222931021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (867661884433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433830942246 + 433830942247.

It is an arithmetic number, because the mean of its divisors is an integer number (433830942247).

Almost surely, 2^867661884493 is an apocalyptic number.

It is an amenable number.

867661884493 is a deficient number, since it is larger than the sum of its proper divisors (1).

867661884493 is an equidigital number, since it uses as much as digits as its factorization.

867661884493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 334430208, while the sum is 70.

The spelling of 867661884493 in words is "eight hundred sixty-seven billion, six hundred sixty-one million, eight hundred eighty-four thousand, four hundred ninety-three".