1555163114977 has 2 divisors, whose sum is σ = 1555163114978. Its totient is φ = 1555163114976.

The previous prime is 1555163114941. The next prime is 1555163114983. The reversal of 1555163114977 is 7794113615551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141187973696 + 413975141281 = 1068264^2 + 643409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555163114977 - 2³¹ = 1553015631329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555163114987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777581557488 + 777581557489.

It is an arithmetic number, because the mean of its divisors is an integer number (777581557489).

Almost surely, 2^{1555163114977} is an apocalyptic number.

It is an amenable number.

1555163114977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555163114977 is an equidigital number, since it uses as much as digits as its factorization.

1555163114977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969000, while the sum is 55.

The spelling of 1555163114977 in words is "one trillion, five hundred fifty-five billion, one hundred sixty-three million, one hundred fourteen thousand, nine hundred seventy-seven".