11656789123661 has 8 divisors (see below), whose sum is σ = 12716522991648. Its totient is φ = 10597059550000.

The previous prime is 11656789123643. The next prime is 11656789123667. The reversal of 11656789123661 is 16632198765611.

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

It is not a de Polignac number, because 11656789123661 - 2¹⁴ = 11656789107277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11656789123594 and 11656789123603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656789123667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7768211 + ... + 9146511.

It is an arithmetic number, because the mean of its divisors is an integer number (1589565373956).

Almost surely, 2^{11656789123661} is an apocalyptic number.

11656789123661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11656789123661 is a deficient number, since it is larger than the sum of its proper divisors (1059733867987).

11656789123661 is a wasteful number, since it uses less digits than its factorization.

11656789123661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147163.

The product of its digits is 19595520, while the sum is 62.

The spelling of 11656789123661 in words is "eleven trillion, six hundred fifty-six billion, seven hundred eighty-nine million, one hundred twenty-three thousand, six hundred sixty-one".