1665055511 has 8 divisors (see below), whose sum is σ = 1943408640. Its totient is φ = 1396824408.

The previous prime is 1665055501. The next prime is 1665055517. The reversal of 1665055511 is 1155505661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665055511 - 2¹⁰ = 1665054487 is a prime.

It is a super-2 number, since 2×1665055511² = 5544819709422942242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665055517) 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 7 ways as a sum of consecutive naturals, for example, 2530151 + ... + 2530808.

It is an arithmetic number, because the mean of its divisors is an integer number (242926080).

Almost surely, 2^1665055511 is an apocalyptic number.

1665055511 is a deficient number, since it is larger than the sum of its proper divisors (278353129).

1665055511 is an equidigital number, since it uses as much as digits as its factorization.

1665055511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061013.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1665055511 is about 40805.0917288517. The cubic root of 1665055511 is about 1185.2489310695.

The spelling of 1665055511 in words is "one billion, six hundred sixty-five million, fifty-five thousand, five hundred eleven".