77749494777 has 6 divisors (see below), whose sum is σ = 112304825802. Its totient is φ = 51832996512.

The previous prime is 77749494763. The next prime is 77749494793.

77749494777 is a `hidden beast` number, since 7 + 77 + 49 + 49 + 477 + 7 = 666.

77749494777 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 70534861056 + 7214633721 = 265584^2 + 84939^2 .

It is not a de Polignac number, because 77749494777 - 2⁴ = 77749494761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77749494707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4319416368 + ... + 4319416385.

It is an arithmetic number, because the mean of its divisors is an integer number (18717470967).

Almost surely, 2^77749494777 is an apocalyptic number.

It is an amenable number.

77749494777 is a deficient number, since it is larger than the sum of its proper divisors (34555331025).

77749494777 is a wasteful number, since it uses less digits than its factorization.

77749494777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8638832759 (or 8638832756 counting only the distinct ones).

The product of its digits is 609892416, while the sum is 72.

The spelling of 77749494777 in words is "seventy-seven billion, seven hundred forty-nine million, four hundred ninety-four thousand, seven hundred seventy-seven".