73705591261 has 2 divisors, whose sum is σ = 73705591262. Its totient is φ = 73705591260.

The previous prime is 73705591181. The next prime is 73705591273. The reversal of 73705591261 is 16219550737.

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., 42562165636 + 31143425625 = 206306^2 + 176475^2 .

It is a cyclic number.

It is not a de Polignac number, because 73705591261 - 2¹¹ = 73705589213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73705591361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36852795630 + 36852795631.

It is an arithmetic number, because the mean of its divisors is an integer number (36852795631).

Almost surely, 2^73705591261 is an apocalyptic number.

It is an amenable number.

73705591261 is a deficient number, since it is larger than the sum of its proper divisors (1).

73705591261 is an equidigital number, since it uses as much as digits as its factorization.

73705591261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 46.

The spelling of 73705591261 in words is "seventy-three billion, seven hundred five million, five hundred ninety-one thousand, two hundred sixty-one".