77782769085 has 64 divisors (see below), whose sum is σ = 150870200832. Its totient is φ = 33405689856.

The previous prime is 77782769083. The next prime is 77782769087. The reversal of 77782769085 is 58096728777.

It is an interprime number because it is at equal distance from previous prime (77782769083) and next prime (77782769087).

It is not a de Polignac number, because 77782769085 - 2¹ = 77782769083 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77782769083) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 955129 + ... + 1033361.

It is an arithmetic number, because the mean of its divisors is an integer number (2357346888).

Almost surely, 2^77782769085 is an apocalyptic number.

It is an amenable number.

77782769085 is a deficient number, since it is larger than the sum of its proper divisors (73087431747).

77782769085 is a wasteful number, since it uses less digits than its factorization.

77782769085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78822.

The product of its (nonzero) digits is 82978560, while the sum is 66.

The spelling of 77782769085 in words is "seventy-seven billion, seven hundred eighty-two million, seven hundred sixty-nine thousand, eighty-five".