10561788217 has 4 divisors (see below), whose sum is σ = 10609150720. Its totient is φ = 10514425716.

The previous prime is 10561788173. The next prime is 10561788239. The reversal of 10561788217 is 71288716501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10561788217 is a prime.

It is a super-2 number, since 2×10561788217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10561708217) 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, 23680917 + ... + 23681362.

It is an arithmetic number, because the mean of its divisors is an integer number (2652287680).

Almost surely, 2^10561788217 is an apocalyptic number.

It is an amenable number.

10561788217 is a deficient number, since it is larger than the sum of its proper divisors (47362503).

10561788217 is an equidigital number, since it uses as much as digits as its factorization.

10561788217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47362502.

The product of its (nonzero) digits is 188160, while the sum is 46.

The spelling of 10561788217 in words is "ten billion, five hundred sixty-one million, seven hundred eighty-eight thousand, two hundred seventeen".