11705621656 has 16 divisors (see below), whose sum is σ = 22902303600. Its totient is φ = 5598340704.

The previous prime is 11705621651. The next prime is 11705621663. The reversal of 11705621656 is 65612650711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11705621651) 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, 31808571 + ... + 31808938.

It is an arithmetic number, because the mean of its divisors is an integer number (1431393975).

Almost surely, 2^11705621656 is an apocalyptic number.

It is an amenable number.

11705621656 is a deficient number, since it is larger than the sum of its proper divisors (11196681944).

11705621656 is a wasteful number, since it uses less digits than its factorization.

11705621656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63617538 (or 63617534 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 11705621656 in words is "eleven billion, seven hundred five million, six hundred twenty-one thousand, six hundred fifty-six".