73661661737 has 2 divisors, whose sum is σ = 73661661738. Its totient is φ = 73661661736.

The previous prime is 73661661727. The next prime is 73661661739. The reversal of 73661661737 is 73716616637.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52479479056 + 21182182681 = 229084^2 + 145541^2 .

It is an emirp because it is prime and its reverse (73716616637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73661661737 - 2¹⁰ = 73661660713 is a prime.

Together with 73661661739, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73661661739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36830830868 + 36830830869.

It is an arithmetic number, because the mean of its divisors is an integer number (36830830869).

Almost surely, 2^73661661737 is an apocalyptic number.

It is an amenable number.

73661661737 is a deficient number, since it is larger than the sum of its proper divisors (1).

73661661737 is an equidigital number, since it uses as much as digits as its factorization.

73661661737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 53.

The spelling of 73661661737 in words is "seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, seven hundred thirty-seven".