5510216520661 has 2 divisors, whose sum is σ = 5510216520662. Its totient is φ = 5510216520660.

The previous prime is 5510216520649. The next prime is 5510216520803. The reversal of 5510216520661 is 1660256120155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4702544046225 + 807672474436 = 2168535^2 + 898706^2 .

It is a cyclic number.

It is not a de Polignac number, because 5510216520661 - 2¹¹ = 5510216518613 is a prime.

It is a super-2 number, since 2×5510216520661² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5510216521661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2755108260330 + 2755108260331.

It is an arithmetic number, because the mean of its divisors is an integer number (2755108260331).

Almost surely, 2^{5510216520661} is an apocalyptic number.

It is an amenable number.

5510216520661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5510216520661 is an equidigital number, since it uses as much as digits as its factorization.

5510216520661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 5510216520661 in words is "five trillion, five hundred ten billion, two hundred sixteen million, five hundred twenty thousand, six hundred sixty-one".