685536157 has 2 divisors, whose sum is σ = 685536158. Its totient is φ = 685536156.

The previous prime is 685536121. The next prime is 685536197. The reversal of 685536157 is 751635586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676572121 + 8964036 = 26011^2 + 2994^2 .

It is a cyclic number.

It is not a de Polignac number, because 685536157 - 2²⁷ = 551318429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685536107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342768078 + 342768079.

It is an arithmetic number, because the mean of its divisors is an integer number (342768079).

Almost surely, 2^685536157 is an apocalyptic number.

It is an amenable number.

685536157 is a deficient number, since it is larger than the sum of its proper divisors (1).

685536157 is an equidigital number, since it uses as much as digits as its factorization.

685536157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756000, while the sum is 46.

The square root of 685536157 is about 26182.7454060876. The cubic root of 685536157 is about 881.7459127069.

The spelling of 685536157 in words is "six hundred eighty-five million, five hundred thirty-six thousand, one hundred fifty-seven".