73704196535561 has 2 divisors, whose sum is σ = 73704196535562. Its totient is φ = 73704196535560.

The previous prime is 73704196535521. The next prime is 73704196535581. The reversal of 73704196535561 is 16553569140737.

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., 52276601825536 + 21427594710025 = 7230256^2 + 4628995^2 .

It is an emirp because it is prime and its reverse (16553569140737) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73704196535561 is a prime.

It is a super-2 number, since 2×73704196535561² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73704196535494 and 73704196535503.

It is not a weakly prime, because it can be changed into another prime (73704196535521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36852098267780 + 36852098267781.

It is an arithmetic number, because the mean of its divisors is an integer number (36852098267781).

Almost surely, 2^{73704196535561} is an apocalyptic number.

It is an amenable number.

73704196535561 is a deficient number, since it is larger than the sum of its proper divisors (1).

73704196535561 is an equidigital number, since it uses as much as digits as its factorization.

73704196535561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442000, while the sum is 62.

The spelling of 73704196535561 in words is "seventy-three trillion, seven hundred four billion, one hundred ninety-six million, five hundred thirty-five thousand, five hundred sixty-one".