82777123787 has 2 divisors, whose sum is σ = 82777123788. Its totient is φ = 82777123786.

The previous prime is 82777123729. The next prime is 82777123789. The reversal of 82777123787 is 78732177728.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82777123787 - 2²⁰ = 82776075211 is a prime.

Together with 82777123789, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82777123789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41388561893 + 41388561894.

It is an arithmetic number, because the mean of its divisors is an integer number (41388561894).

Almost surely, 2^82777123787 is an apocalyptic number.

82777123787 is a deficient number, since it is larger than the sum of its proper divisors (1).

82777123787 is an equidigital number, since it uses as much as digits as its factorization.

82777123787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12907776, while the sum is 59.

The spelling of 82777123787 in words is "eighty-two billion, seven hundred seventy-seven million, one hundred twenty-three thousand, seven hundred eighty-seven".