1685238673557 has 8 divisors (see below), whose sum is σ = 2259973250784. Its totient is φ = 1116998272688.

The previous prime is 1685238673507. The next prime is 1685238673589. The reversal of 1685238673557 is 7553768325861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1685238673557 - 2²⁴ = 1685221896341 is a prime.

It is a super-2 number, since 2×1685238673557² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685238673507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1623543483 + ... + 1623544520.

It is an arithmetic number, because the mean of its divisors is an integer number (282496656348).

Almost surely, 2^{1685238673557} is an apocalyptic number.

It is an amenable number.

1685238673557 is a deficient number, since it is larger than the sum of its proper divisors (574734577227).

1685238673557 is a wasteful number, since it uses less digits than its factorization.

1685238673557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247088179.

The product of its digits is 254016000, while the sum is 66.

The spelling of 1685238673557 in words is "one trillion, six hundred eighty-five billion, two hundred thirty-eight million, six hundred seventy-three thousand, five hundred fifty-seven".