1665495661133 has 4 divisors (see below), whose sum is σ = 1665984509760. Its totient is φ = 1665006812508.

The previous prime is 1665495661117. The next prime is 1665495661189. The reversal of 1665495661133 is 3311665945661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1665495661133 - 2⁴ = 1665495661117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665495681133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244419203 + ... + 244426016.

It is an arithmetic number, because the mean of its divisors is an integer number (416496127440).

Almost surely, 2^{1665495661133} is an apocalyptic number.

It is an amenable number.

1665495661133 is a deficient number, since it is larger than the sum of its proper divisors (488848627).

1665495661133 is an equidigital number, since it uses as much as digits as its factorization.

1665495661133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488848626.

The product of its digits is 10497600, while the sum is 56.

The spelling of 1665495661133 in words is "one trillion, six hundred sixty-five billion, four hundred ninety-five million, six hundred sixty-one thousand, one hundred thirty-three".