77847768551 has 12 divisors (see below), whose sum is σ = 94206025008. Its totient is φ = 62799105792.

The previous prime is 77847768541. The next prime is 77847768611. The reversal of 77847768551 is 15586774877.

It is not a de Polignac number, because 77847768551 - 2²² = 77843574247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77847768541) 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 11 ways as a sum of consecutive naturals, for example, 3030875 + ... + 3056451.

It is an arithmetic number, because the mean of its divisors is an integer number (7850502084).

Almost surely, 2^77847768551 is an apocalyptic number.

77847768551 is a deficient number, since it is larger than the sum of its proper divisors (16358256457).

77847768551 is an frugal number, since it uses more digits than its factorization.

77847768551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51178 (or 25601 counting only the distinct ones).

The product of its digits is 92198400, while the sum is 65.

The spelling of 77847768551 in words is "seventy-seven billion, eight hundred forty-seven million, seven hundred sixty-eight thousand, five hundred fifty-one".