77841246921 has 8 divisors (see below), whose sum is σ = 105996591744. Its totient is φ = 50790033360.

The previous prime is 77841246919. The next prime is 77841246929. The reversal of 77841246921 is 12964214877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77841246921 - 2¹ = 77841246919 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77841246929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276032650 + ... + 276032931.

It is an arithmetic number, because the mean of its divisors is an integer number (13249573968).

Almost surely, 2^77841246921 is an apocalyptic number.

It is an amenable number.

77841246921 is a deficient number, since it is larger than the sum of its proper divisors (28155344823).

77841246921 is a wasteful number, since it uses less digits than its factorization.

77841246921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552065631.

The product of its digits is 1354752, while the sum is 51.

The spelling of 77841246921 in words is "seventy-seven billion, eight hundred forty-one million, two hundred forty-six thousand, nine hundred twenty-one".