1661615011105 has 32 divisors (see below), whose sum is σ = 2295798024960. Its totient is φ = 1130914794240.

The previous prime is 1661615011097. The next prime is 1661615011129. The reversal of 1661615011105 is 5011105161661.

It is not a de Polignac number, because 1661615011105 - 2³ = 1661615011097 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2616586 + ... + 3189004.

It is an arithmetic number, because the mean of its divisors is an integer number (71743688280).

Almost surely, 2^{1661615011105} is an apocalyptic number.

It is an amenable number.

1661615011105 is a deficient number, since it is larger than the sum of its proper divisors (634183013855).

1661615011105 is a wasteful number, since it uses less digits than its factorization.

1661615011105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573049.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 1661615011105 in words is "one trillion, six hundred sixty-one billion, six hundred fifteen million, eleven thousand, one hundred five".