1665263406013 has 4 divisors (see below), whose sum is σ = 1680000250428. Its totient is φ = 1650526561600.

The previous prime is 1665263405989. The next prime is 1665263406041. The reversal of 1665263406013 is 3106043625661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467819064729 + 1197444341284 = 683973^2 + 1094278^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665263406013 - 2²¹ = 1665261308861 is a prime.

It is a super-2 number, since 2×1665263406013² (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 (1665263406413) 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, 7368422038 + ... + 7368422263.

It is an arithmetic number, because the mean of its divisors is an integer number (420000062607).

Almost surely, 2^{1665263406013} is an apocalyptic number.

It is an amenable number.

1665263406013 is a deficient number, since it is larger than the sum of its proper divisors (14736844415).

1665263406013 is a wasteful number, since it uses less digits than its factorization.

1665263406013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14736844414.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 1665263406013 in words is "one trillion, six hundred sixty-five billion, two hundred sixty-three million, four hundred six thousand, thirteen".