1686353545 has 4 divisors (see below), whose sum is σ = 2023624260. Its totient is φ = 1349082832.

The previous prime is 1686353533. The next prime is 1686353609. The reversal of 1686353545 is 5453536861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1252381321 + 433972224 = 35389^2 + 20832^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686353545 - 2¹¹ = 1686351497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1686353495 and 1686353504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168635350 + ... + 168635359.

It is an arithmetic number, because the mean of its divisors is an integer number (505906065).

Almost surely, 2^1686353545 is an apocalyptic number.

It is an amenable number.

1686353545 is a deficient number, since it is larger than the sum of its proper divisors (337270715).

1686353545 is an equidigital number, since it uses as much as digits as its factorization.

1686353545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337270714.

The product of its digits is 1296000, while the sum is 46.

The square root of 1686353545 is about 41065.2352361459. The cubic root of 1686353545 is about 1190.2811154710.

The spelling of 1686353545 in words is "one billion, six hundred eighty-six million, three hundred fifty-three thousand, five hundred forty-five".