77839241673221 has 16 divisors (see below), whose sum is σ = 89845322663808. Its totient is φ = 66054787512000.

The previous prime is 77839241673173. The next prime is 77839241673223. The reversal of 77839241673221 is 12237614293877.

It is a happy number.

It is not a de Polignac number, because 77839241673221 - 2¹⁰ = 77839241672197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77839241673223) 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 15 ways as a sum of consecutive naturals, for example, 8475266 + ... + 15083388.

It is an arithmetic number, because the mean of its divisors is an integer number (5615332666488).

Almost surely, 2^{77839241673221} is an apocalyptic number.

It is an amenable number.

77839241673221 is a deficient number, since it is larger than the sum of its proper divisors (12006080990587).

77839241673221 is a wasteful number, since it uses less digits than its factorization.

77839241673221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624892.

The product of its digits is 42674688, while the sum is 62.

The spelling of 77839241673221 in words is "seventy-seven trillion, eight hundred thirty-nine billion, two hundred forty-one million, six hundred seventy-three thousand, two hundred twenty-one".