77805355553 has 2 divisors, whose sum is σ = 77805355554. Its totient is φ = 77805355552.

The previous prime is 77805355427. The next prime is 77805355561. The reversal of 77805355553 is 35555350877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75194963089 + 2610392464 = 274217^2 + 51092^2 .

It is a cyclic number.

It is not a de Polignac number, because 77805355553 - 2¹⁸ = 77805093409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77805355495 and 77805355504.

It is not a weakly prime, because it can be changed into another prime (77805355153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38902677776 + 38902677777.

It is an arithmetic number, because the mean of its divisors is an integer number (38902677777).

Almost surely, 2^77805355553 is an apocalyptic number.

It is an amenable number.

77805355553 is a deficient number, since it is larger than the sum of its proper divisors (1).

77805355553 is an equidigital number, since it uses as much as digits as its factorization.

77805355553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11025000, while the sum is 53.

The spelling of 77805355553 in words is "seventy-seven billion, eight hundred five million, three hundred fifty-five thousand, five hundred fifty-three".