61516352789 has 2 divisors, whose sum is σ = 61516352790. Its totient is φ = 61516352788.

The previous prime is 61516352741. The next prime is 61516352803. The reversal of 61516352789 is 98725361516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49555212100 + 11961140689 = 222610^2 + 109367^2 .

It is a cyclic number.

It is not a de Polignac number, because 61516352789 - 2⁸ = 61516352533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61516352789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61516352189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30758176394 + 30758176395.

It is an arithmetic number, because the mean of its divisors is an integer number (30758176395).

Almost surely, 2^61516352789 is an apocalyptic number.

It is an amenable number.

61516352789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61516352789 is an equidigital number, since it uses as much as digits as its factorization.

61516352789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The spelling of 61516352789 in words is "sixty-one billion, five hundred sixteen million, three hundred fifty-two thousand, seven hundred eighty-nine".