20261162569 has 2 divisors, whose sum is σ = 20261162570. Its totient is φ = 20261162568.

The previous prime is 20261162557. The next prime is 20261162653. The reversal of 20261162569 is 96526116202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13152649225 + 7108513344 = 114685^2 + 84312^2 .

It is a cyclic number.

It is not a de Polignac number, because 20261162569 - 2²¹ = 20259065417 is a prime.

It is a super-2 number, since 2×20261162569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20261162539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130581284 + 10130581285.

It is an arithmetic number, because the mean of its divisors is an integer number (10130581285).

Almost surely, 2^20261162569 is an apocalyptic number.

It is an amenable number.

20261162569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261162569 is an equidigital number, since it uses as much as digits as its factorization.

20261162569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 20261162569 in words is "twenty billion, two hundred sixty-one million, one hundred sixty-two thousand, five hundred sixty-nine".