82777131979 has 2 divisors, whose sum is σ = 82777131980. Its totient is φ = 82777131978.

The previous prime is 82777131949. The next prime is 82777131989. The reversal of 82777131979 is 97913177728.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82777131979 - 2¹³ = 82777123787 is a prime.

It is not a weakly prime, because it can be changed into another prime (82777131949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41388565989 + 41388565990.

It is an arithmetic number, because the mean of its divisors is an integer number (41388565990).

Almost surely, 2^82777131979 is an apocalyptic number.

82777131979 is a deficient number, since it is larger than the sum of its proper divisors (1).

82777131979 is an equidigital number, since it uses as much as digits as its factorization.

82777131979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9335088, while the sum is 61.

The spelling of 82777131979 in words is "eighty-two billion, seven hundred seventy-seven million, one hundred thirty-one thousand, nine hundred seventy-nine".