1171800227205 has 32 divisors (see below), whose sum is σ = 2103425675520. Its totient is φ = 618892539840.

The previous prime is 1171800227203. The next prime is 1171800227209. The reversal of 1171800227205 is 5027220081711.

It is not a de Polignac number, because 1171800227205 - 2¹ = 1171800227203 is a prime.

It is a super-2 number, since 2×1171800227205² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1171800227205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171800227203) 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, 42122026 + ... + 42149835.

It is an arithmetic number, because the mean of its divisors is an integer number (65732052360).

Almost surely, 2^{1171800227205} is an apocalyptic number.

1171800227205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1171800227205 is a deficient number, since it is larger than the sum of its proper divisors (931625448315).

1171800227205 is a wasteful number, since it uses less digits than its factorization.

1171800227205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84271978 (or 84271972 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The spelling of 1171800227205 in words is "one trillion, one hundred seventy-one billion, eight hundred million, two hundred twenty-seven thousand, two hundred five".