77644332909 has 48 divisors (see below), whose sum is σ = 131912237184. Its totient is φ = 43387228800.

The previous prime is 77644332907. The next prime is 77644332943. The reversal of 77644332909 is 90923344677.

It is not a de Polignac number, because 77644332909 - 2¹ = 77644332907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77644332907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1094304 + ... + 1163094.

It is an arithmetic number, because the mean of its divisors is an integer number (2748171608).

Almost surely, 2^77644332909 is an apocalyptic number.

It is an amenable number.

77644332909 is a deficient number, since it is larger than the sum of its proper divisors (54267904275).

77644332909 is a wasteful number, since it uses less digits than its factorization.

77644332909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69698 (or 69695 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 54.

The spelling of 77644332909 in words is "seventy-seven billion, six hundred forty-four million, three hundred thirty-two thousand, nine hundred nine".