30661565773 has 2 divisors, whose sum is σ = 30661565774. Its totient is φ = 30661565772.

The previous prime is 30661565731. The next prime is 30661565797. The reversal of 30661565773 is 37756516603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30491445924 + 170119849 = 174618^2 + 13043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30661565773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30661560773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15330782886 + 15330782887.

It is an arithmetic number, because the mean of its divisors is an integer number (15330782887).

Almost surely, 2^30661565773 is an apocalyptic number.

It is an amenable number.

30661565773 is a deficient number, since it is larger than the sum of its proper divisors (1).

30661565773 is an equidigital number, since it uses as much as digits as its factorization.

30661565773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2381400, while the sum is 49.

The spelling of 30661565773 in words is "thirty billion, six hundred sixty-one million, five hundred sixty-five thousand, seven hundred seventy-three".