61535521433 has 2 divisors, whose sum is σ = 61535521434. Its totient is φ = 61535521432.

The previous prime is 61535521409. The next prime is 61535521499. The reversal of 61535521433 is 33412553516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39284429209 + 22251092224 = 198203^2 + 149168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61535521433 is a prime.

It is not a weakly prime, because it can be changed into another prime (61535521633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30767760716 + 30767760717.

It is an arithmetic number, because the mean of its divisors is an integer number (30767760717).

Almost surely, 2^61535521433 is an apocalyptic number.

It is an amenable number.

61535521433 is a deficient number, since it is larger than the sum of its proper divisors (1).

61535521433 is an equidigital number, since it uses as much as digits as its factorization.

61535521433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 38.

The spelling of 61535521433 in words is "sixty-one billion, five hundred thirty-five million, five hundred twenty-one thousand, four hundred thirty-three".