2001132004661 has 4 divisors (see below), whose sum is σ = 2118845652012. Its totient is φ = 1883418357312.

The previous prime is 2001132004643. The next prime is 2001132004673. The reversal of 2001132004661 is 1664002311002.

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 1372154532100 + 628977472561 = 1171390^2 + 793081^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2001132004661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001132004661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001132000661) 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, 58856823650 + ... + 58856823683.

It is an arithmetic number, because the mean of its divisors is an integer number (529711413003).

Almost surely, 2^{2001132004661} is an apocalyptic number.

It is an amenable number.

2001132004661 is a deficient number, since it is larger than the sum of its proper divisors (117713647351).

2001132004661 is a wasteful number, since it uses less digits than its factorization.

2001132004661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117713647350.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 2001132004661 its reverse (1664002311002), we get a palindrome (3665134315663).

The spelling of 2001132004661 in words is "two trillion, one billion, one hundred thirty-two million, four thousand, six hundred sixty-one".