77557075553 has 2 divisors, whose sum is σ = 77557075554. Its totient is φ = 77557075552.

The previous prime is 77557075529. The next prime is 77557075573. The reversal of 77557075553 is 35557075577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45412888609 + 32144186944 = 213103^2 + 179288^2 .

It is a cyclic number.

It is not a de Polignac number, because 77557075553 - 2¹² = 77557071457 is a prime.

It is not a weakly prime, because it can be changed into another prime (77557075573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38778537776 + 38778537777.

It is an arithmetic number, because the mean of its divisors is an integer number (38778537777).

Almost surely, 2^77557075553 is an apocalyptic number.

It is an amenable number.

77557075553 is a deficient number, since it is larger than the sum of its proper divisors (1).

77557075553 is an equidigital number, since it uses as much as digits as its factorization.

77557075553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22509375, while the sum is 56.

The spelling of 77557075553 in words is "seventy-seven billion, five hundred fifty-seven million, seventy-five thousand, five hundred fifty-three".