1916648557 has 2 divisors, whose sum is σ = 1916648558. Its totient is φ = 1916648556.

The previous prime is 1916648509. The next prime is 1916648603. The reversal of 1916648557 is 7558466191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1861577316 + 55071241 = 43146^2 + 7421^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916648557 - 2⁷ = 1916648429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1916648057) 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, 958324278 + 958324279.

It is an arithmetic number, because the mean of its divisors is an integer number (958324279).

Almost surely, 2^1916648557 is an apocalyptic number.

It is an amenable number.

1916648557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916648557 is an equidigital number, since it uses as much as digits as its factorization.

1916648557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The square root of 1916648557 is about 43779.5449610888. The cubic root of 1916648557 is about 1242.1694067073.

The spelling of 1916648557 in words is "one billion, nine hundred sixteen million, six hundred forty-eight thousand, five hundred fifty-seven".