77972000173 has 2 divisors, whose sum is σ = 77972000174. Its totient is φ = 77972000172.

The previous prime is 77972000153. The next prime is 77972000219. The reversal of 77972000173 is 37100027977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74967535204 + 3004464969 = 273802^2 + 54813^2 .

It is a cyclic number.

It is not a de Polignac number, because 77972000173 - 2²¹ = 77969903021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77972000153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38986000086 + 38986000087.

It is an arithmetic number, because the mean of its divisors is an integer number (38986000087).

Almost surely, 2^77972000173 is an apocalyptic number.

It is an amenable number.

77972000173 is a deficient number, since it is larger than the sum of its proper divisors (1).

77972000173 is an equidigital number, since it uses as much as digits as its factorization.

77972000173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129654, while the sum is 43.

The spelling of 77972000173 in words is "seventy-seven billion, nine hundred seventy-two million, one hundred seventy-three", and thus it is an aban number.