1686605041 has 4 divisors (see below), whose sum is σ = 1839932784. Its totient is φ = 1533277300.

The previous prime is 1686605027. The next prime is 1686605047. The reversal of 1686605041 is 1405066861.

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 not a de Polignac number, because 1686605041 - 2⁵ = 1686605009 is a prime.

It is a super-3 number, since 3×1686605041³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1686605047) 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, 76663855 + ... + 76663876.

It is an arithmetic number, because the mean of its divisors is an integer number (459983196).

Almost surely, 2^1686605041 is an apocalyptic number.

1686605041 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1686605041 is a deficient number, since it is larger than the sum of its proper divisors (153327743).

1686605041 is a wasteful number, since it uses less digits than its factorization.

1686605041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153327742.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1686605041 is about 41068.2972741749. The cubic root of 1686605041 is about 1190.3402837793.

The spelling of 1686605041 in words is "one billion, six hundred eighty-six million, six hundred five thousand, forty-one".