20261524124161 has 2 divisors, whose sum is σ = 20261524124162. Its totient is φ = 20261524124160.

The previous prime is 20261524124147. The next prime is 20261524124209. The reversal of 20261524124161 is 16142142516202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20024909006400 + 236615117761 = 4474920^2 + 486431^2 .

It is a cyclic number.

It is not a de Polignac number, because 20261524124161 - 2²³ = 20261515735553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20261524124161.

It is not a weakly prime, because it can be changed into another prime (20261524124461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130762062080 + 10130762062081.

It is an arithmetic number, because the mean of its divisors is an integer number (10130762062081).

Almost surely, 2^{20261524124161} is an apocalyptic number.

It is an amenable number.

20261524124161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261524124161 is an equidigital number, since it uses as much as digits as its factorization.

20261524124161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 20261524124161 in words is "twenty trillion, two hundred sixty-one billion, five hundred twenty-four million, one hundred twenty-four thousand, one hundred sixty-one".