77920413253 has 2 divisors, whose sum is σ = 77920413254. Its totient is φ = 77920413252.

The previous prime is 77920413217. The next prime is 77920413271. The reversal of 77920413253 is 35231402977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69763072129 + 8157341124 = 264127^2 + 90318^2 .

It is an emirp because it is prime and its reverse (35231402977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77920413253 - 2³³ = 69330478661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77920413283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38960206626 + 38960206627.

It is an arithmetic number, because the mean of its divisors is an integer number (38960206627).

Almost surely, 2^77920413253 is an apocalyptic number.

It is an amenable number.

77920413253 is a deficient number, since it is larger than the sum of its proper divisors (1).

77920413253 is an equidigital number, since it uses as much as digits as its factorization.

77920413253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 77920413253 in words is "seventy-seven billion, nine hundred twenty million, four hundred thirteen thousand, two hundred fifty-three".