2017942181977 has 2 divisors, whose sum is σ = 2017942181978. Its totient is φ = 2017942181976.

The previous prime is 2017942181929. The next prime is 2017942182019. The reversal of 2017942181977 is 7791812497102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1905451705161 + 112490476816 = 1380381^2 + 335396^2 .

It is a cyclic number.

It is not a de Polignac number, because 2017942181977 - 2³¹ = 2015794698329 is a prime.

It is not a weakly prime, because it can be changed into another prime (2017942181477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1008971090988 + 1008971090989.

It is an arithmetic number, because the mean of its divisors is an integer number (1008971090989).

Almost surely, 2^{2017942181977} is an apocalyptic number.

It is an amenable number.

2017942181977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2017942181977 is an equidigital number, since it uses as much as digits as its factorization.

2017942181977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 58.

The spelling of 2017942181977 in words is "two trillion, seventeen billion, nine hundred forty-two million, one hundred eighty-one thousand, nine hundred seventy-seven".