1975555484657 has 2 divisors, whose sum is σ = 1975555484658. Its totient is φ = 1975555484656.

The previous prime is 1975555484603. The next prime is 1975555484671. The reversal of 1975555484657 is 7564845555791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1844514380641 + 131041104016 = 1358129^2 + 361996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1975555484657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1975555484557) 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, 987777742328 + 987777742329.

It is an arithmetic number, because the mean of its divisors is an integer number (987777742329).

Almost surely, 2^{1975555484657} is an apocalyptic number.

It is an amenable number.

1975555484657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975555484657 is an equidigital number, since it uses as much as digits as its factorization.

1975555484657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400000, while the sum is 71.

The spelling of 1975555484657 in words is "one trillion, nine hundred seventy-five billion, five hundred fifty-five million, four hundred eighty-four thousand, six hundred fifty-seven".