1809957227871 has 32 divisors (see below), whose sum is σ = 2608711178752. Its totient is φ = 1109628512640.

The previous prime is 1809957227849. The next prime is 1809957227941. The reversal of 1809957227871 is 1787227599081.

It is not a de Polignac number, because 1809957227871 - 2⁹ = 1809957227359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809957227801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10952766 + ... + 11116788.

It is an arithmetic number, because the mean of its divisors is an integer number (81522224336).

Almost surely, 2^{1809957227871} is an apocalyptic number.

1809957227871 is a deficient number, since it is larger than the sum of its proper divisors (798753950881).

1809957227871 is a wasteful number, since it uses less digits than its factorization.

1809957227871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165103.

The product of its (nonzero) digits is 35562240, while the sum is 66.

The spelling of 1809957227871 in words is "one trillion, eight hundred nine billion, nine hundred fifty-seven million, two hundred twenty-seven thousand, eight hundred seventy-one".