1166865211512 has 320 divisors, whose sum is σ = 4388213491200. Its totient is φ = 279767727360.

The previous prime is 1166865211507. The next prime is 1166865211529. The reversal of 1166865211512 is 2151125686611.

1166865211512 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 86 + 52 + 1 + 1 + 512 = 666.

It is a super-2 number, since 2×1166865211512² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 250812 + ... + 1548107.

It is an arithmetic number, because the mean of its divisors is an integer number (13713167160).

Almost surely, 2^{1166865211512} is an apocalyptic number.

1166865211512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1166865211512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2194106745600).

1166865211512 is an abundant number, since it is smaller than the sum of its proper divisors (3221348279688).

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

1166865211512 is a wasteful number, since it uses less digits than its factorization.

1166865211512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798968 (or 1798955 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The spelling of 1166865211512 in words is "one trillion, one hundred sixty-six billion, eight hundred sixty-five million, two hundred eleven thousand, five hundred twelve".