1686540745 has 8 divisors (see below), whose sum is σ = 2052354240. Its totient is φ = 1330229040.

The previous prime is 1686540731. The next prime is 1686540799. The reversal of 1686540745 is 5470456861.

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

It is not a de Polignac number, because 1686540745 - 2¹³ = 1686532553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1686540695 and 1686540704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2375055 + ... + 2375764.

It is an arithmetic number, because the mean of its divisors is an integer number (256544280).

Almost surely, 2^1686540745 is an apocalyptic number.

It is an amenable number.

1686540745 is a deficient number, since it is larger than the sum of its proper divisors (365813495).

1686540745 is an equidigital number, since it uses as much as digits as its factorization.

1686540745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750895.

The product of its (nonzero) digits is 806400, while the sum is 46.

The square root of 1686540745 is about 41067.5144731210. The cubic root of 1686540745 is about 1190.3251577145.

The spelling of 1686540745 in words is "one billion, six hundred eighty-six million, five hundred forty thousand, seven hundred forty-five".