1663614561111 has 4 divisors (see below), whose sum is σ = 2218152748152. Its totient is φ = 1109076374072.

The previous prime is 1663614561083. The next prime is 1663614561157. The reversal of 1663614561111 is 1111654163661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1663614561111 - 2¹¹ = 1663614559063 is a prime.

It is a super-2 number, since 2×1663614561111² (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 (1663614561611) 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 3 ways as a sum of consecutive naturals, for example, 277269093516 + ... + 277269093521.

It is an arithmetic number, because the mean of its divisors is an integer number (554538187038).

Almost surely, 2^{1663614561111} is an apocalyptic number.

1663614561111 is a deficient number, since it is larger than the sum of its proper divisors (554538187041).

1663614561111 is an equidigital number, since it uses as much as digits as its factorization.

1663614561111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554538187040.

The product of its digits is 77760, while the sum is 42.

The spelling of 1663614561111 in words is "one trillion, six hundred sixty-three billion, six hundred fourteen million, five hundred sixty-one thousand, one hundred eleven".