1191911666860 has 24 divisors (see below), whose sum is σ = 2503156553856. Its totient is φ = 476737608960.

The previous prime is 1191911666837. The next prime is 1191911666863. The reversal of 1191911666860 is 686661191911.

It is not an unprimeable number, because it can be changed into a prime (1191911666863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1327996 + ... + 2036515.

It is an arithmetic number, because the mean of its divisors is an integer number (104298189744).

Almost surely, 2^{1191911666860} is an apocalyptic number.

1191911666860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191911666860 is an abundant number, since it is smaller than the sum of its proper divisors (1311244886996).

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

1191911666860 is a wasteful number, since it uses less digits than its factorization.

1191911666860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382233 (or 3382231 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 55.

The spelling of 1191911666860 in words is "one trillion, one hundred ninety-one billion, nine hundred eleven million, six hundred sixty-six thousand, eight hundred sixty".