685283645677 has 2 divisors, whose sum is σ = 685283645678. Its totient is φ = 685283645676.

The previous prime is 685283645663. The next prime is 685283645699. The reversal of 685283645677 is 776546382586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427335456681 + 257948188996 = 653709^2 + 507886^2 .

It is a cyclic number.

It is not a de Polignac number, because 685283645677 - 2³¹ = 683136162029 is a prime.

It is a super-2 number, since 2×685283645677² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685283645077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342641822838 + 342641822839.

It is an arithmetic number, because the mean of its divisors is an integer number (342641822839).

Almost surely, 2^685283645677 is an apocalyptic number.

It is an amenable number.

685283645677 is a deficient number, since it is larger than the sum of its proper divisors (1).

685283645677 is an equidigital number, since it uses as much as digits as its factorization.

685283645677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 406425600, while the sum is 67.

The spelling of 685283645677 in words is "six hundred eighty-five billion, two hundred eighty-three million, six hundred forty-five thousand, six hundred seventy-seven".