499998777655691 has 2 divisors, whose sum is σ = 499998777655692. Its totient is φ = 499998777655690.

The previous prime is 499998777655603. The next prime is 499998777655843. The reversal of 499998777655691 is 196556777899994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499998777655691 - 2¹⁰ = 499998777654667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 499998777655591 and 499998777655600.

It is not a weakly prime, because it can be changed into another prime (499998770655691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249999388827845 + 249999388827846.

It is an arithmetic number, because the mean of its divisors is an integer number (249999388827846).

Almost surely, 2^{499998777655691} is an apocalyptic number.

499998777655691 is a deficient number, since it is larger than the sum of its proper divisors (1).

499998777655691 is an equidigital number, since it uses as much as digits as its factorization.

499998777655691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583309641600, while the sum is 101.

The spelling of 499998777655691 in words is "four hundred ninety-nine trillion, nine hundred ninety-eight billion, seven hundred seventy-seven million, six hundred fifty-five thousand, six hundred ninety-one".