877643881969 has 2 divisors, whose sum is σ = 877643881970. Its totient is φ = 877643881968.

The previous prime is 877643881949. The next prime is 877643882009. The reversal of 877643881969 is 969188346778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613226815744 + 264417066225 = 783088^2 + 514215^2 .

It is a cyclic number.

It is not a de Polignac number, because 877643881969 - 2¹¹ = 877643879921 is a prime.

It is a super-2 number, since 2×877643881969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 877643881895 and 877643881904.

It is not a weakly prime, because it can be changed into another prime (877643881949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438821940984 + 438821940985.

It is an arithmetic number, because the mean of its divisors is an integer number (438821940985).

Almost surely, 2^877643881969 is an apocalyptic number.

It is an amenable number.

877643881969 is a deficient number, since it is larger than the sum of its proper divisors (1).

877643881969 is an equidigital number, since it uses as much as digits as its factorization.

877643881969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 877879296, while the sum is 76.

The spelling of 877643881969 in words is "eight hundred seventy-seven billion, six hundred forty-three million, eight hundred eighty-one thousand, nine hundred sixty-nine".