1686161380 has 24 divisors (see below), whose sum is σ = 3554413632. Its totient is φ = 671897952.

The previous prime is 1686161369. The next prime is 1686161383. The reversal of 1686161380 is 831616861.

It is not an unprimeable number, because it can be changed into a prime (1686161383) by changing a digit.

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, 155022 + ... + 165541.

It is an arithmetic number, because the mean of its divisors is an integer number (148100568).

Almost surely, 2^1686161380 is an apocalyptic number.

1686161380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686161380 is an abundant number, since it is smaller than the sum of its proper divisors (1868252252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686161380 is a wasteful number, since it uses less digits than its factorization.

1686161380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320835 (or 320833 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1686161380 is about 41062.8954166654. The cubic root of 1686161380 is about 1190.2359017296.

The spelling of 1686161380 in words is "one billion, six hundred eighty-six million, one hundred sixty-one thousand, three hundred eighty".