77805265553 has 2 divisors, whose sum is σ = 77805265554. Its totient is φ = 77805265552.

The previous prime is 77805265543. The next prime is 77805265591. The reversal of 77805265553 is 35556250877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57129126289 + 20676139264 = 239017^2 + 143792^2 .

It is a cyclic number.

It is not a de Polignac number, because 77805265553 - 2¹⁶ = 77805200017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77805265495 and 77805265504.

It is not a weakly prime, because it can be changed into another prime (77805265543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38902632776 + 38902632777.

It is an arithmetic number, because the mean of its divisors is an integer number (38902632777).

Almost surely, 2^77805265553 is an apocalyptic number.

It is an amenable number.

77805265553 is a deficient number, since it is larger than the sum of its proper divisors (1).

77805265553 is an equidigital number, since it uses as much as digits as its factorization.

77805265553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820000, while the sum is 53.

The spelling of 77805265553 in words is "seventy-seven billion, eight hundred five million, two hundred sixty-five thousand, five hundred fifty-three".