20618758297 has 2 divisors, whose sum is σ = 20618758298. Its totient is φ = 20618758296.

The previous prime is 20618758243. The next prime is 20618758327. The reversal of 20618758297 is 79285781602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17700705936 + 2918052361 = 133044^2 + 54019^2 .

It is a cyclic number.

It is not a de Polignac number, because 20618758297 - 2²⁷ = 20484540569 is a prime.

It is not a weakly prime, because it can be changed into another prime (20618758207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309379148 + 10309379149.

It is an arithmetic number, because the mean of its divisors is an integer number (10309379149).

Almost surely, 2^20618758297 is an apocalyptic number.

It is an amenable number.

20618758297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20618758297 is an equidigital number, since it uses as much as digits as its factorization.

20618758297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 20618758297 in words is "twenty billion, six hundred eighteen million, seven hundred fifty-eight thousand, two hundred ninety-seven".