77905544447 has 16 divisors (see below), whose sum is σ = 83687340000. Its totient is φ = 72305478144.

The previous prime is 77905544443. The next prime is 77905544459. The reversal of 77905544447 is 74444550977.

It is a cyclic number.

It is not a de Polignac number, because 77905544447 - 2² = 77905544443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77905544392 and 77905544401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77905544443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18179 + ... + 395147.

It is an arithmetic number, because the mean of its divisors is an integer number (5230458750).

Almost surely, 2^77905544447 is an apocalyptic number.

77905544447 is a deficient number, since it is larger than the sum of its proper divisors (5781795553).

77905544447 is a wasteful number, since it uses less digits than its factorization.

77905544447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377210.

The product of its (nonzero) digits is 19756800, while the sum is 56.

The spelling of 77905544447 in words is "seventy-seven billion, nine hundred five million, five hundred forty-four thousand, four hundred forty-seven".