1811901991002 has 16 divisors (see below), whose sum is σ = 3634752034272. Its totient is φ = 602142654960.

The previous prime is 1811901991001. The next prime is 1811901991057. The reversal of 1811901991002 is 2001991091181.

It is not an unprimeable number, because it can be changed into a prime (1811901991001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456166693 + ... + 456170664.

It is an arithmetic number, because the mean of its divisors is an integer number (227172002142).

Almost surely, 2^{1811901991002} is an apocalyptic number.

1811901991002 is an abundant number, since it is smaller than the sum of its proper divisors (1822850043270).

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

1811901991002 is a wasteful number, since it uses less digits than its factorization.

1811901991002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912337693.

The product of its (nonzero) digits is 11664, while the sum is 42.

The spelling of 1811901991002 in words is "one trillion, eight hundred eleven billion, nine hundred one million, nine hundred ninety-one thousand, two".