1887171672205 has 16 divisors (see below), whose sum is σ = 2475167099904. Its totient is φ = 1375092829440.

The previous prime is 1887171672203. The next prime is 1887171672241. The reversal of 1887171672205 is 5022761717881.

It is not a de Polignac number, because 1887171672205 - 2¹ = 1887171672203 is a prime.

It is a super-2 number, since 2×1887171672205² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1887171672203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358094457 + ... + 358099726.

It is an arithmetic number, because the mean of its divisors is an integer number (154697943744).

Almost surely, 2^{1887171672205} is an apocalyptic number.

It is an amenable number.

1887171672205 is a deficient number, since it is larger than the sum of its proper divisors (587995427699).

1887171672205 is a wasteful number, since it uses less digits than its factorization.

1887171672205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716194236.

The product of its (nonzero) digits is 2634240, while the sum is 55.

The spelling of 1887171672205 in words is "one trillion, eight hundred eighty-seven billion, one hundred seventy-one million, six hundred seventy-two thousand, two hundred five".