73438208773 has 2 divisors, whose sum is σ = 73438208774. Its totient is φ = 73438208772.

The previous prime is 73438208771. The next prime is 73438208797. The reversal of 73438208773 is 37780283437.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72995611329 + 442597444 = 270177^2 + 21038^2 .

It is a cyclic number.

It is not a de Polignac number, because 73438208773 - 2¹ = 73438208771 is a prime.

Together with 73438208771, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 73438208773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73438208771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36719104386 + 36719104387.

It is an arithmetic number, because the mean of its divisors is an integer number (36719104387).

Almost surely, 2^73438208773 is an apocalyptic number.

It is an amenable number.

73438208773 is a deficient number, since it is larger than the sum of its proper divisors (1).

73438208773 is an equidigital number, since it uses as much as digits as its factorization.

73438208773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 52.

The spelling of 73438208773 in words is "seventy-three billion, four hundred thirty-eight million, two hundred eight thousand, seven hundred seventy-three".