61334663521 has 2 divisors, whose sum is σ = 61334663522. Its totient is φ = 61334663520.

The previous prime is 61334663501. The next prime is 61334663557. The reversal of 61334663521 is 12536643316.

61334663521 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., 60103425600 + 1231237921 = 245160^2 + 35089^2 .

It is a cyclic number.

It is not a de Polignac number, because 61334663521 - 2²¹ = 61332566369 is a prime.

It is not a weakly prime, because it can be changed into another prime (61334663501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30667331760 + 30667331761.

It is an arithmetic number, because the mean of its divisors is an integer number (30667331761).

Almost surely, 2^61334663521 is an apocalyptic number.

It is an amenable number.

61334663521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61334663521 is an equidigital number, since it uses as much as digits as its factorization.

61334663521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The spelling of 61334663521 in words is "sixty-one billion, three hundred thirty-four million, six hundred sixty-three thousand, five hundred twenty-one".