20656556611 has 8 divisors (see below), whose sum is σ = 21920002560. Its totient is φ = 19423555272.

The previous prime is 20656556587. The next prime is 20656556623. The reversal of 20656556611 is 11665565602.

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

It is a cyclic number.

It is not a de Polignac number, because 20656556611 - 2⁷ = 20656556483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20656556671) 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, 7609755 + ... + 7612468.

It is an arithmetic number, because the mean of its divisors is an integer number (2740000320).

Almost surely, 2^20656556611 is an apocalyptic number.

20656556611 is a deficient number, since it is larger than the sum of its proper divisors (1263445949).

20656556611 is a wasteful number, since it uses less digits than its factorization.

20656556611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15222305.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 20656556611 in words is "twenty billion, six hundred fifty-six million, five hundred fifty-six thousand, six hundred eleven".