1811221760194 has 128 divisors (see below), whose sum is σ = 3653782401024. Its totient is φ = 651801600000.

The previous prime is 1811221760191. The next prime is 1811221760287. The reversal of 1811221760194 is 4910671221181.

It is a self number, because there is not a number n which added to its sum of digits gives 1811221760194.

It is not an unprimeable number, because it can be changed into a prime (1811221760191) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32783794 + ... + 32838994.

It is an arithmetic number, because the mean of its divisors is an integer number (28545175008).

Almost surely, 2^{1811221760194} is an apocalyptic number.

1811221760194 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1811221760194 is an abundant number, since it is smaller than the sum of its proper divisors (1842560640830).

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

1811221760194 is a wasteful number, since it uses less digits than its factorization.

1811221760194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55472.

The product of its (nonzero) digits is 48384, while the sum is 43.

The spelling of 1811221760194 in words is "one trillion, eight hundred eleven billion, two hundred twenty-one million, seven hundred sixty thousand, one hundred ninety-four".