1002011001990 has 16 divisors (see below), whose sum is σ = 2404826404848. Its totient is φ = 267202933856.

The previous prime is 1002011001989. The next prime is 1002011002061. The reversal of 1002011001990 is 991001102001.

It is a self number, because there is not a number n which added to its sum of digits gives 1002011001990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16700183337 + ... + 16700183396.

It is an arithmetic number, because the mean of its divisors is an integer number (150301650303).

Almost surely, 2^{1002011001990} is an apocalyptic number.

1002011001990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1002011001990 is an abundant number, since it is smaller than the sum of its proper divisors (1402815402858).

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

1002011001990 is a wasteful number, since it uses less digits than its factorization.

1002011001990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33400366743.

The product of its (nonzero) digits is 162, while the sum is 24.

Adding to 1002011001990 its reverse (991001102001), we get a palindrome (1993012103991).

The spelling of 1002011001990 in words is "one trillion, two billion, eleven million, one thousand, nine hundred ninety".