61604613589 has 2 divisors, whose sum is σ = 61604613590. Its totient is φ = 61604613588.

The previous prime is 61604613529. The next prime is 61604613593. The reversal of 61604613589 is 98531640616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37193051025 + 24411562564 = 192855^2 + 156242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61604613589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61604613529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802306794 + 30802306795.

It is an arithmetic number, because the mean of its divisors is an integer number (30802306795).

Almost surely, 2^61604613589 is an apocalyptic number.

It is an amenable number.

61604613589 is a deficient number, since it is larger than the sum of its proper divisors (1).

61604613589 is an equidigital number, since it uses as much as digits as its factorization.

61604613589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 61604613589 in words is "sixty-one billion, six hundred four million, six hundred thirteen thousand, five hundred eighty-nine".