872865785881 has 2 divisors, whose sum is σ = 872865785882. Its totient is φ = 872865785880.

The previous prime is 872865785809. The next prime is 872865785929. The reversal of 872865785881 is 188587568278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 724132921600 + 148732864281 = 850960^2 + 385659^2 .

It is a cyclic number.

It is not a de Polignac number, because 872865785881 - 2¹⁷ = 872865654809 is a prime.

It is a super-2 number, since 2×872865785881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (872865782881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436432892940 + 436432892941.

It is an arithmetic number, because the mean of its divisors is an integer number (436432892941).

Almost surely, 2^872865785881 is an apocalyptic number.

It is an amenable number.

872865785881 is a deficient number, since it is larger than the sum of its proper divisors (1).

872865785881 is an equidigital number, since it uses as much as digits as its factorization.

872865785881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 481689600, while the sum is 73.

The spelling of 872865785881 in words is "eight hundred seventy-two billion, eight hundred sixty-five million, seven hundred eighty-five thousand, eight hundred eighty-one".