1916640640867 has 2 divisors, whose sum is σ = 1916640640868. Its totient is φ = 1916640640866.

The previous prime is 1916640640777. The next prime is 1916640640931. The reversal of 1916640640867 is 7680460466191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1916640640867 - 2³¹ = 1914493157219 is a prime.

It is a super-2 number, since 2×1916640640867² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1916640640367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958320320433 + 958320320434.

It is an arithmetic number, because the mean of its divisors is an integer number (958320320434).

Almost surely, 2^{1916640640867} is an apocalyptic number.

1916640640867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916640640867 is an equidigital number, since it uses as much as digits as its factorization.

1916640640867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 1916640640867 in words is "one trillion, nine hundred sixteen billion, six hundred forty million, six hundred forty thousand, eight hundred sixty-seven".