77993999911 has 16 divisors (see below), whose sum is σ = 82145138688. Its totient is φ = 73958119200.

The previous prime is 77993999873. The next prime is 77993999947. The reversal of 77993999911 is 11999939977.

It is a cyclic number.

It is not a de Polignac number, because 77993999911 - 2¹⁷ = 77993868839 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 (77993999311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250065 + ... + 467461.

It is an arithmetic number, because the mean of its divisors is an integer number (5134071168).

Almost surely, 2^77993999911 is an apocalyptic number.

77993999911 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

77993999911 is a deficient number, since it is larger than the sum of its proper divisors (4151138777).

77993999911 is a wasteful number, since it uses less digits than its factorization.

77993999911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217662.

The product of its digits is 78121827, while the sum is 73.

The spelling of 77993999911 in words is "seventy-seven billion, nine hundred ninety-three million, nine hundred ninety-nine thousand, nine hundred eleven".