20727757760509 has 2 divisors, whose sum is σ = 20727757760510. Its totient is φ = 20727757760508.

The previous prime is 20727757760497. The next prime is 20727757760587. The reversal of 20727757760509 is 90506775772702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15685734512484 + 5042023248025 = 3960522^2 + 2245445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727757760509 - 2¹⁵ = 20727757727741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20727757760599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363878880254 + 10363878880255.

It is an arithmetic number, because the mean of its divisors is an integer number (10363878880255).

Almost surely, 2^{20727757760509} is an apocalyptic number.

It is an amenable number.

20727757760509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727757760509 is an equidigital number, since it uses as much as digits as its factorization.

20727757760509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90757800, while the sum is 64.

The spelling of 20727757760509 in words is "twenty trillion, seven hundred twenty-seven billion, seven hundred fifty-seven million, seven hundred sixty thousand, five hundred nine".