1685667312556 has 6 divisors (see below), whose sum is σ = 2949917796980. Its totient is φ = 842833656276.

The previous prime is 1685667312493. The next prime is 1685667312619. The reversal of 1685667312556 is 6552137665861.

It is an interprime number because it is at equal distance from previous prime (1685667312493) and next prime (1685667312619).

It is a junction number, because it is equal to n+sod(n) for n = 1685667312494 and 1685667312503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210708414066 + ... + 210708414073.

Almost surely, 2^{1685667312556} is an apocalyptic number.

It is an amenable number.

1685667312556 is a deficient number, since it is larger than the sum of its proper divisors (1264250484424).

1685667312556 is a wasteful number, since it uses less digits than its factorization.

1685667312556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421416828143 (or 421416828141 counting only the distinct ones).

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

The spelling of 1685667312556 in words is "one trillion, six hundred eighty-five billion, six hundred sixty-seven million, three hundred twelve thousand, five hundred fifty-six".