977678876789 has 2 divisors, whose sum is σ = 977678876790. Its totient is φ = 977678876788.

The previous prime is 977678876767. The next prime is 977678876869. The reversal of 977678876789 is 987678876779.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654335388100 + 323343488689 = 808910^2 + 568633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-977678876789 is a prime.

It is a super-2 number, since 2×977678876789² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977678870789) 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, 488839438394 + 488839438395.

It is an arithmetic number, because the mean of its divisors is an integer number (488839438395).

Almost surely, 2^977678876789 is an apocalyptic number.

It is an amenable number.

977678876789 is a deficient number, since it is larger than the sum of its proper divisors (1).

977678876789 is an equidigital number, since it uses as much as digits as its factorization.

977678876789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25092716544, while the sum is 89.

The spelling of 977678876789 in words is "nine hundred seventy-seven billion, six hundred seventy-eight million, eight hundred seventy-six thousand, seven hundred eighty-nine".