979661957777 has 2 divisors, whose sum is σ = 979661957778. Its totient is φ = 979661957776.

The previous prime is 979661957669. The next prime is 979661957837. The reversal of 979661957777 is 777759166979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514259660161 + 465402297616 = 717119^2 + 682204^2 .

It is a cyclic number.

It is not a de Polignac number, because 979661957777 - 2¹⁰ = 979661956753 is a prime.

It is not a weakly prime, because it can be changed into another prime (979661959777) 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, 489830978888 + 489830978889.

It is an arithmetic number, because the mean of its divisors is an integer number (489830978889).

Almost surely, 2^979661957777 is an apocalyptic number.

It is an amenable number.

979661957777 is a deficient number, since it is larger than the sum of its proper divisors (1).

979661957777 is an equidigital number, since it uses as much as digits as its factorization.

979661957777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2205414540, while the sum is 80.

The spelling of 979661957777 in words is "nine hundred seventy-nine billion, six hundred sixty-one million, nine hundred fifty-seven thousand, seven hundred seventy-seven".