1916807427961 has 2 divisors, whose sum is σ = 1916807427962. Its totient is φ = 1916807427960.

The previous prime is 1916807427937. The next prime is 1916807427971. The reversal of 1916807427961 is 1697247086191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1665826467561 + 250980960400 = 1290669^2 + 500980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916807427961 - 2¹¹ = 1916807425913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1916807427961.

It is not a weakly prime, because it can be changed into another prime (1916807427971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958403713980 + 958403713981.

It is an arithmetic number, because the mean of its divisors is an integer number (958403713981).

Almost surely, 2^{1916807427961} is an apocalyptic number.

It is an amenable number.

1916807427961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916807427961 is an equidigital number, since it uses as much as digits as its factorization.

1916807427961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 61.

The spelling of 1916807427961 in words is "one trillion, nine hundred sixteen billion, eight hundred seven million, four hundred twenty-seven thousand, nine hundred sixty-one".