20515541522249 has 2 divisors, whose sum is σ = 20515541522250. Its totient is φ = 20515541522248.

The previous prime is 20515541522153. The next prime is 20515541522257. The reversal of 20515541522249 is 94222514551502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17784101094400 + 2731440427849 = 4217120^2 + 1652707^2 .

It is a cyclic number.

It is not a de Polignac number, because 20515541522249 - 2²⁴ = 20515524745033 is a prime.

It is a super-2 number, since 2×20515541522249² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20515541522269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257770761124 + 10257770761125.

It is an arithmetic number, because the mean of its divisors is an integer number (10257770761125).

Almost surely, 2^{20515541522249} is an apocalyptic number.

It is an amenable number.

20515541522249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20515541522249 is an equidigital number, since it uses as much as digits as its factorization.

20515541522249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440000, while the sum is 47.

The spelling of 20515541522249 in words is "twenty trillion, five hundred fifteen billion, five hundred forty-one million, five hundred twenty-two thousand, two hundred forty-nine".