77550405523 has 2 divisors, whose sum is σ = 77550405524. Its totient is φ = 77550405522.

The previous prime is 77550405521. The next prime is 77550405601. The reversal of 77550405523 is 32550405577.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77550405523 - 2¹ = 77550405521 is a prime.

Together with 77550405521, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 77550405523.

It is not a weakly prime, because it can be changed into another prime (77550405521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38775202761 + 38775202762.

It is an arithmetic number, because the mean of its divisors is an integer number (38775202762).

Almost surely, 2^77550405523 is an apocalyptic number.

77550405523 is a deficient number, since it is larger than the sum of its proper divisors (1).

77550405523 is an equidigital number, since it uses as much as digits as its factorization.

77550405523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 735000, while the sum is 43.

The spelling of 77550405523 in words is "seventy-seven billion, five hundred fifty million, four hundred five thousand, five hundred twenty-three".