1918458964657 has 2 divisors, whose sum is σ = 1918458964658. Its totient is φ = 1918458964656.

The previous prime is 1918458964549. The next prime is 1918458964691. The reversal of 1918458964657 is 7564698548191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984667228416 + 933791736241 = 992304^2 + 966329^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918458964657 - 2⁷ = 1918458964529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1918458964657.

It is not a weakly prime, because it can be changed into another prime (1918452964657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959229482328 + 959229482329.

It is an arithmetic number, because the mean of its divisors is an integer number (959229482329).

Almost surely, 2^{1918458964657} is an apocalyptic number.

It is an amenable number.

1918458964657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918458964657 is an equidigital number, since it uses as much as digits as its factorization.

1918458964657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 522547200, while the sum is 73.

The spelling of 1918458964657 in words is "one trillion, nine hundred eighteen billion, four hundred fifty-eight million, nine hundred sixty-four thousand, six hundred fifty-seven".