1566115161191 has 16 divisors (see below), whose sum is σ = 1794461739840. Its totient is φ = 1338924929280.

The previous prime is 1566115161187. The next prime is 1566115161223. The reversal of 1566115161191 is 1911615116651.

It is a cyclic number.

It is not a de Polignac number, because 1566115161191 - 2² = 1566115161187 is a prime.

It is a super-2 number, since 2×1566115161191² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566115161691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7895315 + ... + 8091243.

It is an arithmetic number, because the mean of its divisors is an integer number (112153858740).

Almost surely, 2^{1566115161191} is an apocalyptic number.

1566115161191 is a deficient number, since it is larger than the sum of its proper divisors (228346578649).

1566115161191 is a wasteful number, since it uses less digits than its factorization.

1566115161191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198874.

The product of its digits is 48600, while the sum is 44.

The spelling of 1566115161191 in words is "one trillion, five hundred sixty-six billion, one hundred fifteen million, one hundred sixty-one thousand, one hundred ninety-one".