1916551181099 has 4 divisors (see below), whose sum is σ = 1917572254464. Its totient is φ = 1915530107736.

The previous prime is 1916551181089. The next prime is 1916551181101. The reversal of 1916551181099 is 9901811556191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1916551181099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1916551181059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510533867 + ... + 510537620.

It is an arithmetic number, because the mean of its divisors is an integer number (479393063616).

Almost surely, 2^{1916551181099} is an apocalyptic number.

1916551181099 is a deficient number, since it is larger than the sum of its proper divisors (1021073365).

1916551181099 is a wasteful number, since it uses less digits than its factorization.

1916551181099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021073364.

The product of its (nonzero) digits is 874800, while the sum is 56.

The spelling of 1916551181099 in words is "one trillion, nine hundred sixteen billion, five hundred fifty-one million, one hundred eighty-one thousand, ninety-nine".