1811949091368 has 64 divisors (see below), whose sum is σ = 5010171116160. Its totient is φ = 542454610176.

The previous prime is 1811949091349. The next prime is 1811949091397. The reversal of 1811949091368 is 8631909491181.

It is a super-2 number, since 2×1811949091368² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78468580 + ... + 78491667.

It is an arithmetic number, because the mean of its divisors is an integer number (78283923690).

Almost surely, 2^{1811949091368} is an apocalyptic number.

It is an amenable number.

1811949091368 is an abundant number, since it is smaller than the sum of its proper divisors (3198222024792).

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

1811949091368 is a wasteful number, since it uses less digits than its factorization.

1811949091368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156960306 (or 156960302 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 60.

The spelling of 1811949091368 in words is "one trillion, eight hundred eleven billion, nine hundred forty-nine million, ninety-one thousand, three hundred sixty-eight".