20116755475549 has 2 divisors, whose sum is σ = 20116755475550. Its totient is φ = 20116755475548.

The previous prime is 20116755475543. The next prime is 20116755475673. The reversal of 20116755475549 is 94557455761102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19919770406649 + 196985068900 = 4463157^2 + 443830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116755475549 - 2²³ = 20116747086941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116755475543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058377737774 + 10058377737775.

It is an arithmetic number, because the mean of its divisors is an integer number (10058377737775).

Almost surely, 2^{20116755475549} is an apocalyptic number.

It is an amenable number.

20116755475549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116755475549 is an equidigital number, since it uses as much as digits as its factorization.

20116755475549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920000, while the sum is 61.

The spelling of 20116755475549 in words is "twenty trillion, one hundred sixteen billion, seven hundred fifty-five million, four hundred seventy-five thousand, five hundred forty-nine".