13656305661 has 8 divisors (see below), whose sum is σ = 18229757280. Its totient is φ = 9093528912.

The previous prime is 13656305657. The next prime is 13656305671. The reversal of 13656305661 is 16650365631.

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

It is not a de Polignac number, because 13656305661 - 2² = 13656305657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13656305671) 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, 2665731 + ... + 2670848.

It is an arithmetic number, because the mean of its divisors is an integer number (2278719660).

Almost surely, 2^13656305661 is an apocalyptic number.

It is an amenable number.

13656305661 is a deficient number, since it is larger than the sum of its proper divisors (4573451619).

13656305661 is an equidigital number, since it uses as much as digits as its factorization.

13656305661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337435.

The product of its (nonzero) digits is 291600, while the sum is 42.

The spelling of 13656305661 in words is "thirteen billion, six hundred fifty-six million, three hundred five thousand, six hundred sixty-one".