20455715495497 has 2 divisors, whose sum is σ = 20455715495498. Its totient is φ = 20455715495496.

The previous prime is 20455715495491. The next prime is 20455715495531. The reversal of 20455715495497 is 79459451755402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19352089608201 + 1103625887296 = 4399101^2 + 1050536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455715495497 - 2¹¹ = 20455715493449 is a prime.

It is a super-3 number, since 3×20455715495497³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20455715495491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227857747748 + 10227857747749.

It is an arithmetic number, because the mean of its divisors is an integer number (10227857747749).

Almost surely, 2^{20455715495497} is an apocalyptic number.

It is an amenable number.

20455715495497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455715495497 is an equidigital number, since it uses as much as digits as its factorization.

20455715495497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520000, while the sum is 67.

The spelling of 20455715495497 in words is "twenty trillion, four hundred fifty-five billion, seven hundred fifteen million, four hundred ninety-five thousand, four hundred ninety-seven".