1916640640866 has 32 divisors (see below), whose sum is σ = 4380994194048. Its totient is φ = 547598949120.

The previous prime is 1916640640777. The next prime is 1916640640867. The reversal of 1916640640866 is 6680460466191.

It is a super-2 number, since 2×1916640640866² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1916640640867) 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 in 15 ways as a sum of consecutive naturals, for example, 1392586 + ... + 2402618.

It is an arithmetic number, because the mean of its divisors is an integer number (136906068564).

Almost surely, 2^{1916640640866} is an apocalyptic number.

1916640640866 is an abundant number, since it is smaller than the sum of its proper divisors (2464353553182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1916640640866 is a wasteful number, since it uses less digits than its factorization.

1916640640866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055226.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 1916640640866 in words is "one trillion, nine hundred sixteen billion, six hundred forty million, six hundred forty thousand, eight hundred sixty-six".