20116756613581 has 2 divisors, whose sum is σ = 20116756613582. Its totient is φ = 20116756613580.

The previous prime is 20116756613533. The next prime is 20116756613617. The reversal of 20116756613581 is 18531665761102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20087732380356 + 29024233225 = 4481934^2 + 170365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116756613581 - 2⁹ = 20116756613069 is a prime.

It is a super-2 number, since 2×20116756613581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116756613501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058378306790 + 10058378306791.

It is an arithmetic number, because the mean of its divisors is an integer number (10058378306791).

Almost surely, 2^{20116756613581} is an apocalyptic number.

It is an amenable number.

20116756613581 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116756613581 is an equidigital number, since it uses as much as digits as its factorization.

20116756613581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 20116756613581 in words is "twenty trillion, one hundred sixteen billion, seven hundred fifty-six million, six hundred thirteen thousand, five hundred eighty-one".