61590320521 has 2 divisors, whose sum is σ = 61590320522. Its totient is φ = 61590320520.

The previous prime is 61590320503. The next prime is 61590320549. The reversal of 61590320521 is 12502309516.

61590320521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61498544121 + 91776400 = 247989^2 + 9580^2 .

It is a cyclic number.

It is not a de Polignac number, because 61590320521 - 2⁹ = 61590320009 is a prime.

It is a super-2 number, since 2×61590320521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61590320551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30795160260 + 30795160261.

It is an arithmetic number, because the mean of its divisors is an integer number (30795160261).

Almost surely, 2^61590320521 is an apocalyptic number.

It is an amenable number.

61590320521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61590320521 is an equidigital number, since it uses as much as digits as its factorization.

61590320521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 61590320521 in words is "sixty-one billion, five hundred ninety million, three hundred twenty thousand, five hundred twenty-one".