2081904308637 has 4 divisors (see below), whose sum is σ = 2775872411520. Its totient is φ = 1387936205756.

The previous prime is 2081904308623. The next prime is 2081904308683. The reversal of 2081904308637 is 7368034091802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2081904308637 - 2⁷ = 2081904308509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2081904308637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081904308537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346984051437 + ... + 346984051442.

It is an arithmetic number, because the mean of its divisors is an integer number (693968102880).

Almost surely, 2^{2081904308637} is an apocalyptic number.

It is an amenable number.

2081904308637 is a deficient number, since it is larger than the sum of its proper divisors (693968102883).

2081904308637 is an equidigital number, since it uses as much as digits as its factorization.

2081904308637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693968102882.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 2081904308637 in words is "two trillion, eighty-one billion, nine hundred four million, three hundred eight thousand, six hundred thirty-seven".