77442424477 has 12 divisors (see below), whose sum is σ = 85232887740. Its totient is φ = 70311042560.

The previous prime is 77442424471. The next prime is 77442424481.

77442424477 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 11153683321 + 66288741156 = 105611^2 + 257466^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77442424477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77442424471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320452 + ... + 507517.

It is an arithmetic number, because the mean of its divisors is an integer number (7102740645).

Almost surely, 2^77442424477 is an apocalyptic number.

It is an amenable number.

77442424477 is a deficient number, since it is larger than the sum of its proper divisors (7790463263).

77442424477 is a wasteful number, since it uses less digits than its factorization.

77442424477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828764 (or 828753 counting only the distinct ones).

The product of its digits is 9834496, while the sum is 52.

The spelling of 77442424477 in words is "seventy-seven billion, four hundred forty-two million, four hundred twenty-four thousand, four hundred seventy-seven".