1685335831657 has 4 divisors (see below), whose sum is σ = 1685409750016. Its totient is φ = 1685261913300.

The previous prime is 1685335831591. The next prime is 1685335831703. The reversal of 1685335831657 is 7561385335861.

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-1685335831657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1685335831595 and 1685335831604.

It is not an unprimeable number, because it can be changed into a prime (1685335831357) 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, 36924969 + ... + 36970582.

It is an arithmetic number, because the mean of its divisors is an integer number (421352437504).

Almost surely, 2^{1685335831657} is an apocalyptic number.

It is an amenable number.

1685335831657 is a deficient number, since it is larger than the sum of its proper divisors (73918359).

1685335831657 is an equidigital number, since it uses as much as digits as its factorization.

1685335831657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73918358.

The product of its digits is 54432000, while the sum is 61.

The spelling of 1685335831657 in words is "one trillion, six hundred eighty-five billion, three hundred thirty-five million, eight hundred thirty-one thousand, six hundred fifty-seven".