1171121728164 has 24 divisors (see below), whose sum is σ = 2734194227520. Its totient is φ = 390148643424.

The previous prime is 1171121728159. The next prime is 1171121728177. The reversal of 1171121728164 is 4618271211711.

It is a super-2 number, since 2×1171121728164² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28136584 + ... + 28178175.

It is an arithmetic number, because the mean of its divisors is an integer number (113924759480).

Almost surely, 2^{1171121728164} is an apocalyptic number.

It is an amenable number.

1171121728164 is an abundant number, since it is smaller than the sum of its proper divisors (1563072499356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1171121728164 is a wasteful number, since it uses less digits than its factorization.

1171121728164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56316499 (or 56316497 counting only the distinct ones).

The product of its digits is 37632, while the sum is 42.

Adding to 1171121728164 its reverse (4618271211711), we get a palindrome (5789392939875).

The spelling of 1171121728164 in words is "one trillion, one hundred seventy-one billion, one hundred twenty-one million, seven hundred twenty-eight thousand, one hundred sixty-four".