999999955777 has 2 divisors, whose sum is σ = 999999955778. Its totient is φ = 999999955776.

The previous prime is 999999955771. The next prime is 999999955783. The reversal of 999999955777 is 777559999999.

It is a balanced prime because it is at equal distance from previous prime (999999955771) and next prime (999999955783).

It can be written as a sum of positive squares in only one way, i.e., 991121793601 + 8878162176 = 995551^2 + 94224^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999955777 - 2³ = 999999955769 is a prime.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999999955771) 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, 499999977888 + 499999977889.

It is an arithmetic number, because the mean of its divisors is an integer number (499999977889).

Almost surely, 2^999999955777 is an apocalyptic number.

It is an amenable number.

999999955777 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999955777 is an equidigital number, since it uses as much as digits as its factorization.

999999955777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41013959175, while the sum is 94.

The spelling of 999999955777 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred fifty-five thousand, seven hundred seventy-seven".