20515553713 has 2 divisors, whose sum is σ = 20515553714. Its totient is φ = 20515553712.

The previous prime is 20515553693. The next prime is 20515553741. The reversal of 20515553713 is 31735551502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15390139249 + 5125414464 = 124057^2 + 71592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20515553713 is a prime.

It is not a weakly prime, because it can be changed into another prime (20515554713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257776856 + 10257776857.

It is an arithmetic number, because the mean of its divisors is an integer number (10257776857).

Almost surely, 2^20515553713 is an apocalyptic number.

It is an amenable number.

20515553713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20515553713 is an equidigital number, since it uses as much as digits as its factorization.

20515553713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78750, while the sum is 37.

The spelling of 20515553713 in words is "twenty billion, five hundred fifteen million, five hundred fifty-three thousand, seven hundred thirteen".