77999999999 has 2 divisors, whose sum is σ = 78000000000. Its totient is φ = 77999999998.

The previous prime is 77999999963. The next prime is 78000000007. The reversal of 77999999999 is 99999999977.

It is a strong prime.

It is an emirp because it is prime and its reverse (99999999977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77999999999 - 2¹² = 77999995903 is a prime.

77999999999 is a modest number, since divided by 999999 gives 77999 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77999999929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999999999 + 39000000000.

It is an arithmetic number, because the mean of its divisors is an integer number (39000000000).

Almost surely, 2^77999999999 is an apocalyptic number.

77999999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

77999999999 is an equidigital number, since it uses as much as digits as its factorization.

77999999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18983603961, while the sum is 95.

The spelling of 77999999999 in words is "seventy-seven billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".