1816911907902 has 128 divisors (see below), whose sum is σ = 5039323269120. Its totient is φ = 472436375040.

The previous prime is 1816911907879. The next prime is 1816911907939. The reversal of 1816911907902 is 2097091196181.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 2254923 + ... + 2952710.

It is an arithmetic number, because the mean of its divisors is an integer number (39369713040).

Almost surely, 2^{1816911907902} is an apocalyptic number.

1816911907902 is an abundant number, since it is smaller than the sum of its proper divisors (3222411361218).

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

1816911907902 is a wasteful number, since it uses less digits than its factorization.

1816911907902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207735 (or 5207729 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 54.

The spelling of 1816911907902 in words is "one trillion, eight hundred sixteen billion, nine hundred eleven million, nine hundred seven thousand, nine hundred two".