77454645477 has 24 divisors (see below), whose sum is σ = 113879962560. Its totient is φ = 46791201600.

The previous prime is 77454645467. The next prime is 77454645479.

77454645477 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77454645477 - 2¹⁴ = 77454629093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77454645477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77454645479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230152 + ... + 455937.

It is an arithmetic number, because the mean of its divisors is an integer number (4744998440).

Almost surely, 2^77454645477 is an apocalyptic number.

It is an amenable number.

77454645477 is a deficient number, since it is larger than the sum of its proper divisors (36425317083).

77454645477 is a wasteful number, since it uses less digits than its factorization.

77454645477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686425 (or 686414 counting only the distinct ones).

The product of its digits is 92198400, while the sum is 60.

The spelling of 77454645477 in words is "seventy-seven billion, four hundred fifty-four million, six hundred forty-five thousand, four hundred seventy-seven".