685283127657 has 4 divisors (see below), whose sum is σ = 913710836880. Its totient is φ = 456855418436.

The previous prime is 685283127631. The next prime is 685283127671. The reversal of 685283127657 is 756721382586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685283127657 is a prime.

It is a super-2 number, since 2×685283127657² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 685283127657.

It is not an unprimeable number, because it can be changed into a prime (685283127677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114213854607 + ... + 114213854612.

It is an arithmetic number, because the mean of its divisors is an integer number (228427709220).

Almost surely, 2^685283127657 is an apocalyptic number.

It is an amenable number.

685283127657 is a deficient number, since it is larger than the sum of its proper divisors (228427709223).

685283127657 is a wasteful number, since it uses less digits than its factorization.

685283127657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228427709222.

The product of its digits is 33868800, while the sum is 60.

The spelling of 685283127657 in words is "six hundred eighty-five billion, two hundred eighty-three million, one hundred twenty-seven thousand, six hundred fifty-seven".