1999148459177 has 2 divisors, whose sum is σ = 1999148459178. Its totient is φ = 1999148459176.

The previous prime is 1999148459167. The next prime is 1999148459233. The reversal of 1999148459177 is 7719548419991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1573860575296 + 425287883881 = 1254536^2 + 652141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999148459177 - 2⁸ = 1999148458921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999148459137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999574229588 + 999574229589.

It is an arithmetic number, because the mean of its divisors is an integer number (999574229589).

Almost surely, 2^{1999148459177} is an apocalyptic number.

It is an amenable number.

1999148459177 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999148459177 is an equidigital number, since it uses as much as digits as its factorization.

1999148459177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205752960, while the sum is 74.

The spelling of 1999148459177 in words is "one trillion, nine hundred ninety-nine billion, one hundred forty-eight million, four hundred fifty-nine thousand, one hundred seventy-seven".