1665511165155 has 16 divisors (see below), whose sum is σ = 2665348719264. Its totient is φ = 888095669760.

The previous prime is 1665511165151. The next prime is 1665511165207. The reversal of 1665511165155 is 5515611155661.

It is not a de Polignac number, because 1665511165155 - 2² = 1665511165151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665511165151) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10981654 + ... + 11132283.

It is an arithmetic number, because the mean of its divisors is an integer number (166584294954).

Almost surely, 2^{1665511165155} is an apocalyptic number.

1665511165155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665511165155 is a deficient number, since it is larger than the sum of its proper divisors (999837554109).

1665511165155 is a wasteful number, since it uses less digits than its factorization.

1665511165155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22118966.

The product of its digits is 675000, while the sum is 48.

The spelling of 1665511165155 in words is "one trillion, six hundred sixty-five billion, five hundred eleven million, one hundred sixty-five thousand, one hundred fifty-five".