20355253401697 has 2 divisors, whose sum is σ = 20355253401698. Its totient is φ = 20355253401696.

The previous prime is 20355253401617. The next prime is 20355253401701. The reversal of 20355253401697 is 79610435255302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20249631001681 + 105622400016 = 4499959^2 + 324996^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355253401697 - 2²⁷ = 20355119183969 is a prime.

It is a super-3 number, since 3×20355253401697³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20355253401617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177626700848 + 10177626700849.

It is an arithmetic number, because the mean of its divisors is an integer number (10177626700849).

Almost surely, 2^{20355253401697} is an apocalyptic number.

It is an amenable number.

20355253401697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355253401697 is an equidigital number, since it uses as much as digits as its factorization.

20355253401697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804000, while the sum is 52.

Adding to 20355253401697 its reverse (79610435255302), we get a palindrome (99965688656999).

The spelling of 20355253401697 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred one thousand, six hundred ninety-seven".