73620172789 has 2 divisors, whose sum is σ = 73620172790. Its totient is φ = 73620172788.

The previous prime is 73620172781. The next prime is 73620172807. The reversal of 73620172789 is 98727102637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51362516689 + 22257656100 = 226633^2 + 149190^2 .

It is an emirp because it is prime and its reverse (98727102637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73620172789 - 2³ = 73620172781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73620172781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36810086394 + 36810086395.

It is an arithmetic number, because the mean of its divisors is an integer number (36810086395).

Almost surely, 2^73620172789 is an apocalyptic number.

It is an amenable number.

73620172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

73620172789 is an equidigital number, since it uses as much as digits as its factorization.

73620172789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 73620172789 in words is "seventy-three billion, six hundred twenty million, one hundred seventy-two thousand, seven hundred eighty-nine".