1188066378221 has 4 divisors (see below), whose sum is σ = 1188439166592. Its totient is φ = 1187693589852.

The previous prime is 1188066378203. The next prime is 1188066378287. The reversal of 1188066378221 is 1228736608811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1188066378221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188066371221) 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 3 ways as a sum of consecutive naturals, for example, 186389405 + ... + 186395778.

It is an arithmetic number, because the mean of its divisors is an integer number (297109791648).

Almost surely, 2^{1188066378221} is an apocalyptic number.

It is an amenable number.

1188066378221 is a deficient number, since it is larger than the sum of its proper divisors (372788371).

1188066378221 is an equidigital number, since it uses as much as digits as its factorization.

1188066378221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372788370.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 1188066378221 in words is "one trillion, one hundred eighty-eight billion, sixty-six million, three hundred seventy-eight thousand, two hundred twenty-one".