10217155561 has 4 divisors (see below), whose sum is σ = 10569471300. Its totient is φ = 9864839824.

The previous prime is 10217155541. The next prime is 10217155573. The reversal of 10217155561 is 16555171201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16555171201 = 373 ⋅44383837.

It can be written as a sum of positive squares in 2 ways, for example, as 8787937536 + 1429218025 = 93744^2 + 37805^2 .

It is a cyclic number.

It is not a de Polignac number, because 10217155561 - 2¹⁵ = 10217122793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10217155541) 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, 176157826 + ... + 176157883.

It is an arithmetic number, because the mean of its divisors is an integer number (2642367825).

Almost surely, 2^10217155561 is an apocalyptic number.

It is an amenable number.

10217155561 is a deficient number, since it is larger than the sum of its proper divisors (352315739).

10217155561 is an equidigital number, since it uses as much as digits as its factorization.

10217155561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352315738.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 10217155561 in words is "ten billion, two hundred seventeen million, one hundred fifty-five thousand, five hundred sixty-one".