1191198166839 has 12 divisors (see below), whose sum is σ = 1746300464376. Its totient is φ = 782279392752.

The previous prime is 1191198166819. The next prime is 1191198166867. The reversal of 1191198166839 is 9386618911911.

It is not a de Polignac number, because 1191198166839 - 2²³ = 1191189778231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191198166819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 987725904 + ... + 987727109.

It is an arithmetic number, because the mean of its divisors is an integer number (145525038698).

Almost surely, 2^{1191198166839} is an apocalyptic number.

1191198166839 is a deficient number, since it is larger than the sum of its proper divisors (555102297537).

1191198166839 is a wasteful number, since it uses less digits than its factorization.

1191198166839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975453086 (or 1975453083 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 63.

The spelling of 1191198166839 in words is "one trillion, one hundred ninety-one billion, one hundred ninety-eight million, one hundred sixty-six thousand, eight hundred thirty-nine".