1685130572077 has 2 divisors, whose sum is σ = 1685130572078. Its totient is φ = 1685130572076.

The previous prime is 1685130572071. The next prime is 1685130572089. The reversal of 1685130572077 is 7702750315861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1278665669961 + 406464902116 = 1130781^2 + 637546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685130572077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685130572071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842565286038 + 842565286039.

It is an arithmetic number, because the mean of its divisors is an integer number (842565286039).

Almost surely, 2^{1685130572077} is an apocalyptic number.

It is an amenable number.

1685130572077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685130572077 is an equidigital number, since it uses as much as digits as its factorization.

1685130572077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2469600, while the sum is 52.

The spelling of 1685130572077 in words is "one trillion, six hundred eighty-five billion, one hundred thirty million, five hundred seventy-two thousand, seventy-seven".