55516500016121 has 2 divisors, whose sum is σ = 55516500016122. Its totient is φ = 55516500016120.

The previous prime is 55516500016093. The next prime is 55516500016127. The reversal of 55516500016121 is 12161000561555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49553433936400 + 5963066079721 = 7039420^2 + 2441939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55516500016121 is a prime.

It is not a weakly prime, because it can be changed into another prime (55516500016127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27758250008060 + 27758250008061.

It is an arithmetic number, because the mean of its divisors is an integer number (27758250008061).

Almost surely, 2^{55516500016121} is an apocalyptic number.

It is an amenable number.

55516500016121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55516500016121 is an equidigital number, since it uses as much as digits as its factorization.

55516500016121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 38.

Adding to 55516500016121 its reverse (12161000561555), we get a palindrome (67677500577676).

The spelling of 55516500016121 in words is "fifty-five trillion, five hundred sixteen billion, five hundred million, sixteen thousand, one hundred twenty-one".