685877143329 has 81 divisors (see below), whose sum is σ = 1166090457753. Its totient is φ = 387348321024.

The previous prime is 685877143327. The next prime is 685877143331. The reversal of 685877143329 is 923341778586.

The square root of 685877143329 is 828177.

It is a perfect power (a square), and thus also a powerful number.

685877143329 is a `hidden beast` number, since 6 + 8 + 587 + 7 + 1 + 43 + 3 + 2 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (685877143327) and next prime (685877143331).

It can be written as a sum of positive squares in 4 ways, for example, as 108356180625 + 577520962704 = 329175^2 + 759948^2 .

It is not a de Polignac number, because 685877143329 - 2¹ = 685877143327 is a prime.

It is a super-2 number, since 2×685877143329² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (685877143327) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1965263847 + ... + 1965264195.

Almost surely, 2^685877143329 is an apocalyptic number.

685877143329 is the 828177-th square number.

685877143329 is the 414089-th centered octagonal number.

It is an amenable number.

685877143329 is a deficient number, since it is larger than the sum of its proper divisors (480213314424).

685877143329 is an equidigital number, since it uses as much as digits as its factorization.

685877143329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 472 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 685877143329 in words is "six hundred eighty-five billion, eight hundred seventy-seven million, one hundred forty-three thousand, three hundred twenty-nine".