1191040079556 has 24 divisors (see below), whose sum is σ = 2810319291360. Its totient is φ = 392552535232.

The previous prime is 1191040079507. The next prime is 1191040079573. The reversal of 1191040079556 is 6559700401911.

It is a super-2 number, since 2×1191040079556² (a number of 25 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 557601966 + ... + 557604101.

It is an arithmetic number, because the mean of its divisors is an integer number (117096637140).

Almost surely, 2^{1191040079556} is an apocalyptic number.

It is an amenable number.

1191040079556 is an abundant number, since it is smaller than the sum of its proper divisors (1619279211804).

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

1191040079556 is a wasteful number, since it uses less digits than its factorization.

1191040079556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115206163 (or 1115206161 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 48.

The spelling of 1191040079556 in words is "one trillion, one hundred ninety-one billion, forty million, seventy-nine thousand, five hundred fifty-six".