61526755685321 has 2 divisors, whose sum is σ = 61526755685322. Its totient is φ = 61526755685320.

The previous prime is 61526755685303. The next prime is 61526755685323. The reversal of 61526755685321 is 12358655762516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50584811290000 + 10941944395321 = 7112300^2 + 3307861^2 .

It is a cyclic number.

It is not a de Polignac number, because 61526755685321 - 2¹⁰ = 61526755684297 is a prime.

It is a super-2 number, since 2×61526755685321² (a number of 28 digits) contains 22 as substring.

Together with 61526755685323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61526755685323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30763377842660 + 30763377842661.

It is an arithmetic number, because the mean of its divisors is an integer number (30763377842661).

Almost surely, 2^{61526755685321} is an apocalyptic number.

It is an amenable number.

61526755685321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61526755685321 is an equidigital number, since it uses as much as digits as its factorization.

61526755685321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720000, while the sum is 62.

The spelling of 61526755685321 in words is "sixty-one trillion, five hundred twenty-six billion, seven hundred fifty-five million, six hundred eighty-five thousand, three hundred twenty-one".