1191327656400 has 720 divisors, whose sum is σ = 5134019338240. Its totient is φ = 249646924800.

The previous prime is 1191327656371. The next prime is 1191327656411. The reversal of 1191327656400 is 46567231911.

1191327656400 is a `hidden beast` number, since 1 + 1 + 9 + 13 + 2 + 76 + 564 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 143 ways as a sum of consecutive naturals, for example, 14802669 + ... + 14882931.

Almost surely, 2^{1191327656400} is an apocalyptic number.

1191327656400 is a gapful number since it is divisible by the number (10) 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 1191327656400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2567009669120).

1191327656400 is an abundant number, since it is smaller than the sum of its proper divisors (3942691681840).

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

1191327656400 is a wasteful number, since it uses less digits than its factorization.

1191327656400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80344 (or 80330 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 1191327656400 in words is "one trillion, one hundred ninety-one billion, three hundred twenty-seven million, six hundred fifty-six thousand, four hundred".