77185981673 has 2 divisors, whose sum is σ = 77185981674. Its totient is φ = 77185981672.

The previous prime is 77185981667. The next prime is 77185981699. The reversal of 77185981673 is 37618958177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68690119744 + 8495861929 = 262088^2 + 92173^2 .

It is a cyclic number.

It is not a de Polignac number, because 77185981673 - 2¹⁴ = 77185965289 is a prime.

It is not a weakly prime, because it can be changed into another prime (77185981633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38592990836 + 38592990837.

It is an arithmetic number, because the mean of its divisors is an integer number (38592990837).

Almost surely, 2^77185981673 is an apocalyptic number.

It is an amenable number.

77185981673 is a deficient number, since it is larger than the sum of its proper divisors (1).

77185981673 is an equidigital number, since it uses as much as digits as its factorization.

77185981673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17781120, while the sum is 62.

The spelling of 77185981673 in words is "seventy-seven billion, one hundred eighty-five million, nine hundred eighty-one thousand, six hundred seventy-three".