10561216501 has 12 divisors (see below), whose sum is σ = 11619611500. Its totient is φ = 9592007040.

The previous prime is 10561216489. The next prime is 10561216507.

It is a happy number.

10561216501 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 7097894001 + 3463322500 = 84249^2 + 58850^2 .

It is not a de Polignac number, because 10561216501 - 2¹⁵ = 10561183733 is a prime.

It is a super-2 number, since 2×10561216501² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10561216501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10561216507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88525 + ... + 170173.

Almost surely, 2^10561216501 is an apocalyptic number.

10561216501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10561216501 is a deficient number, since it is larger than the sum of its proper divisors (1058394999).

10561216501 is a wasteful number, since it uses less digits than its factorization.

10561216501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82740 (or 82729 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 10561216501 in words is "ten billion, five hundred sixty-one million, two hundred sixteen thousand, five hundred one".