77613646439 has 4 divisors (see below), whose sum is σ = 88701310224. Its totient is φ = 66525982656.

The previous prime is 77613646391. The next prime is 77613646463. The reversal of 77613646439 is 93464631677.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 77613646439 - 2¹² = 77613642343 is a prime.

It is a super-2 number, since 2×77613646439² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77613646139) 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 3 ways as a sum of consecutive naturals, for example, 5543831882 + ... + 5543831895.

It is an arithmetic number, because the mean of its divisors is an integer number (22175327556).

Almost surely, 2^77613646439 is an apocalyptic number.

77613646439 is a deficient number, since it is larger than the sum of its proper divisors (11087663785).

77613646439 is a wasteful number, since it uses less digits than its factorization.

77613646439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11087663784.

The product of its digits is 13716864, while the sum is 56.

The spelling of 77613646439 in words is "seventy-seven billion, six hundred thirteen million, six hundred forty-six thousand, four hundred thirty-nine".