61561510597 has 2 divisors, whose sum is σ = 61561510598. Its totient is φ = 61561510596.

The previous prime is 61561510589. The next prime is 61561510613. The reversal of 61561510597 is 79501516516.

It is a happy number.

61561510597 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., 50080173796 + 11481336801 = 223786^2 + 107151^2 .

It is a cyclic number.

It is not a de Polignac number, because 61561510597 - 2³ = 61561510589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61561510697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30780755298 + 30780755299.

It is an arithmetic number, because the mean of its divisors is an integer number (30780755299).

Almost surely, 2^61561510597 is an apocalyptic number.

It is an amenable number.

61561510597 is a deficient number, since it is larger than the sum of its proper divisors (1).

61561510597 is an equidigital number, since it uses as much as digits as its factorization.

61561510597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 283500, while the sum is 46.

The spelling of 61561510597 in words is "sixty-one billion, five hundred sixty-one million, five hundred ten thousand, five hundred ninety-seven".