20761752161 has 2 divisors, whose sum is σ = 20761752162. Its totient is φ = 20761752160.

The previous prime is 20761752157. The next prime is 20761752191. The reversal of 20761752161 is 16125716702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15956489761 + 4805262400 = 126319^2 + 69320^2 .

It is a cyclic number.

It is not a de Polignac number, because 20761752161 - 2² = 20761752157 is a prime.

It is not a weakly prime, because it can be changed into another prime (20761752191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10380876080 + 10380876081.

It is an arithmetic number, because the mean of its divisors is an integer number (10380876081).

Almost surely, 2^20761752161 is an apocalyptic number.

It is an amenable number.

20761752161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20761752161 is an equidigital number, since it uses as much as digits as its factorization.

20761752161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 20761752161 in words is "twenty billion, seven hundred sixty-one million, seven hundred fifty-two thousand, one hundred sixty-one".