677779999991 has 2 divisors, whose sum is σ = 677779999992. Its totient is φ = 677779999990.

The previous prime is 677779999987. The next prime is 677779999999. The reversal of 677779999991 is 199999977776.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 677779999991 - 2² = 677779999987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 677779999897 and 677779999906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677779999999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338889999995 + 338889999996.

It is an arithmetic number, because the mean of its divisors is an integer number (338889999996).

Almost surely, 2^677779999991 is an apocalyptic number.

677779999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

677779999991 is an equidigital number, since it uses as much as digits as its factorization.

677779999991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7655939046, while the sum is 89.

The spelling of 677779999991 in words is "six hundred seventy-seven billion, seven hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".