1990118860801 has 4 divisors (see below), whose sum is σ = 1990135286100. Its totient is φ = 1990102435504.

The previous prime is 1990118860783. The next prime is 1990118860813. The reversal of 1990118860801 is 1080688110991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 849206482576 + 1140912378225 = 921524^2 + 1068135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990118860801 - 2³¹ = 1987971377153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990118860871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8029546 + ... + 8273683.

It is an arithmetic number, because the mean of its divisors is an integer number (497533821525).

Almost surely, 2^{1990118860801} is an apocalyptic number.

It is an amenable number.

1990118860801 is a deficient number, since it is larger than the sum of its proper divisors (16425299).

1990118860801 is a wasteful number, since it uses less digits than its factorization.

1990118860801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16425298.

The product of its (nonzero) digits is 248832, while the sum is 52.

The spelling of 1990118860801 in words is "one trillion, nine hundred ninety billion, one hundred eighteen million, eight hundred sixty thousand, eight hundred one".