56563761717721 has 16 divisors (see below), whose sum is σ = 59147638239744. Its totient is φ = 53990337798144.

The previous prime is 56563761717719. The next prime is 56563761717763. The reversal of 56563761717721 is 12771716736565.

It is a cyclic number.

It is not a de Polignac number, because 56563761717721 - 2¹ = 56563761717719 is a prime.

It is a super-3 number, since 3×56563761717721³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56563761717791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34458976 + ... + 36063118.

It is an arithmetic number, because the mean of its divisors is an integer number (3696727389984).

Almost surely, 2^{56563761717721} is an apocalyptic number.

It is an amenable number.

56563761717721 is a deficient number, since it is larger than the sum of its proper divisors (2583876522023).

56563761717721 is a wasteful number, since it uses less digits than its factorization.

56563761717721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607400.

The product of its digits is 77792400, while the sum is 64.

The spelling of 56563761717721 in words is "fifty-six trillion, five hundred sixty-three billion, seven hundred sixty-one million, seven hundred seventeen thousand, seven hundred twenty-one".