1958941599977 has 2 divisors, whose sum is σ = 1958941599978. Its totient is φ = 1958941599976.

The previous prime is 1958941599961. The next prime is 1958941600009. The reversal of 1958941599977 is 7799951498591.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994639203856 + 964302396121 = 997316^2 + 981989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1958941599977 - 2⁴ = 1958941599961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1958941599895 and 1958941599904.

It is not a weakly prime, because it can be changed into another prime (1958941599917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979470799988 + 979470799989.

It is an arithmetic number, because the mean of its divisors is an integer number (979470799989).

Almost surely, 2^{1958941599977} is an apocalyptic number.

It is an amenable number.

1958941599977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1958941599977 is an equidigital number, since it uses as much as digits as its factorization.

1958941599977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2314720800, while the sum is 83.

The spelling of 1958941599977 in words is "one trillion, nine hundred fifty-eight billion, nine hundred forty-one million, five hundred ninety-nine thousand, nine hundred seventy-seven".