77648709233 has 2 divisors, whose sum is σ = 77648709234. Its totient is φ = 77648709232.

The previous prime is 77648709221. The next prime is 77648709241. The reversal of 77648709233 is 33290784677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70598084209 + 7050625024 = 265703^2 + 83968^2 .

It is a cyclic number.

It is not a de Polignac number, because 77648709233 - 2²² = 77644514929 is a prime.

It is not a weakly prime, because it can be changed into another prime (77648709293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38824354616 + 38824354617.

It is an arithmetic number, because the mean of its divisors is an integer number (38824354617).

Almost surely, 2^77648709233 is an apocalyptic number.

It is an amenable number.

77648709233 is a deficient number, since it is larger than the sum of its proper divisors (1).

77648709233 is an equidigital number, since it uses as much as digits as its factorization.

77648709233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10668672, while the sum is 56.

The spelling of 77648709233 in words is "seventy-seven billion, six hundred forty-eight million, seven hundred nine thousand, two hundred thirty-three".