20997550079963 has 2 divisors, whose sum is σ = 20997550079964. Its totient is φ = 20997550079962.

The previous prime is 20997550079959. The next prime is 20997550080037. The reversal of 20997550079963 is 36997005579902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20997550079963 - 2² = 20997550079959 is a prime.

It is a super-3 number, since 3×20997550079963³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20997550079903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498775039981 + 10498775039982.

It is an arithmetic number, because the mean of its divisors is an integer number (10498775039982).

Almost surely, 2^{20997550079963} is an apocalyptic number.

20997550079963 is a deficient number, since it is larger than the sum of its proper divisors (1).

20997550079963 is an equidigital number, since it uses as much as digits as its factorization.

20997550079963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 289340100, while the sum is 71.

The spelling of 20997550079963 in words is "twenty trillion, nine hundred ninety-seven billion, five hundred fifty million, seventy-nine thousand, nine hundred sixty-three".