1665137770911 has 10 divisors (see below), whose sum is σ = 2487428028272. Its totient is φ = 1110091847220.

The previous prime is 1665137770909. The next prime is 1665137770939. The reversal of 1665137770911 is 1190777315661.

It is a happy number.

It is not a de Polignac number, because 1665137770911 - 2¹ = 1665137770909 is a prime.

It is a super-2 number, since 2×1665137770911² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665137770111) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10278628135 + ... + 10278628296.

Almost surely, 2^{1665137770911} is an apocalyptic number.

1665137770911 is a deficient number, since it is larger than the sum of its proper divisors (822290257361).

1665137770911 is an equidigital number, since it uses as much as digits as its factorization.

1665137770911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20557256443 (or 20557256434 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 54.

The spelling of 1665137770911 in words is "one trillion, six hundred sixty-five billion, one hundred thirty-seven million, seven hundred seventy thousand, nine hundred eleven".