61520325261281 has 2 divisors, whose sum is σ = 61520325261282. Its totient is φ = 61520325261280.

The previous prime is 61520325261229. The next prime is 61520325261319. The reversal of 61520325261281 is 18216252302516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61178052289600 + 342272971681 = 7821640^2 + 585041^2 .

It is a cyclic number.

It is not a de Polignac number, because 61520325261281 - 2⁶ = 61520325261217 is a prime.

It is a super-2 number, since 2×61520325261281² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61520325261781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760162630640 + 30760162630641.

It is an arithmetic number, because the mean of its divisors is an integer number (30760162630641).

Almost surely, 2^{61520325261281} is an apocalyptic number.

It is an amenable number.

61520325261281 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520325261281 is an equidigital number, since it uses as much as digits as its factorization.

61520325261281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

Adding to 61520325261281 its reverse (18216252302516), we get a palindrome (79736577563797).

The spelling of 61520325261281 in words is "sixty-one trillion, five hundred twenty billion, three hundred twenty-five million, two hundred sixty-one thousand, two hundred eighty-one".