311161778777 has 2 divisors, whose sum is σ = 311161778778. Its totient is φ = 311161778776.

The previous prime is 311161778743. The next prime is 311161778843. The reversal of 311161778777 is 777877161113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298767187216 + 12394591561 = 546596^2 + 111331^2 .

It is a cyclic number.

It is not a de Polignac number, because 311161778777 - 2¹⁴ = 311161762393 is a prime.

It is not a weakly prime, because it can be changed into another prime (311161771777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155580889388 + 155580889389.

It is an arithmetic number, because the mean of its divisors is an integer number (155580889389).

Almost surely, 2^311161778777 is an apocalyptic number.

It is an amenable number.

311161778777 is a deficient number, since it is larger than the sum of its proper divisors (1).

311161778777 is an equidigital number, since it uses as much as digits as its factorization.

311161778777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2420208, while the sum is 56.

The spelling of 311161778777 in words is "three hundred eleven billion, one hundred sixty-one million, seven hundred seventy-eight thousand, seven hundred seventy-seven".