977122796821 has 2 divisors, whose sum is σ = 977122796822. Its totient is φ = 977122796820.

The previous prime is 977122796813. The next prime is 977122796891. The reversal of 977122796821 is 128697221779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 976193400625 + 929396196 = 988025^2 + 30486^2 .

It is a cyclic number.

It is not a de Polignac number, because 977122796821 - 2³ = 977122796813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 977122796821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977122796891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488561398410 + 488561398411.

It is an arithmetic number, because the mean of its divisors is an integer number (488561398411).

Almost surely, 2^977122796821 is an apocalyptic number.

It is an amenable number.

977122796821 is a deficient number, since it is larger than the sum of its proper divisors (1).

977122796821 is an equidigital number, since it uses as much as digits as its factorization.

977122796821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10668672, while the sum is 61.

The spelling of 977122796821 in words is "nine hundred seventy-seven billion, one hundred twenty-two million, seven hundred ninety-six thousand, eight hundred twenty-one".