11013665256661 has 4 divisors (see below), whose sum is σ = 11014787849824. Its totient is φ = 11012542663500.

The previous prime is 11013665256637. The next prime is 11013665256697. The reversal of 11013665256661 is 16665256631011.

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 11013665256661 - 2⁴³ = 2217572234453 is a prime.

It is a super-2 number, since 2×11013665256661² (a number of 27 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 (11013665250661) 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, 561281865 + ... + 561301486.

It is an arithmetic number, because the mean of its divisors is an integer number (2753696962456).

Almost surely, 2^{11013665256661} is an apocalyptic number.

It is an amenable number.

11013665256661 is a deficient number, since it is larger than the sum of its proper divisors (1122593163).

11013665256661 is an equidigital number, since it uses as much as digits as its factorization.

11013665256661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122593162.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 11013665256661 in words is "eleven trillion, thirteen billion, six hundred sixty-five million, two hundred fifty-six thousand, six hundred sixty-one".