1686161377 has 4 divisors (see below), whose sum is σ = 1687106736. Its totient is φ = 1685216020.

The previous prime is 1686161369. The next prime is 1686161383. The reversal of 1686161377 is 7731616861.

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 1686161377 - 2³ = 1686161369 is a prime.

It is a super-2 number, since 2×1686161377² = 5686280378573072258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1686167377) 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 3 ways as a sum of consecutive naturals, for example, 469999 + ... + 473572.

It is an arithmetic number, because the mean of its divisors is an integer number (421776684).

Almost surely, 2^1686161377 is an apocalyptic number.

It is an amenable number.

1686161377 is a deficient number, since it is larger than the sum of its proper divisors (945359).

1686161377 is an equidigital number, since it uses as much as digits as its factorization.

1686161377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945358.

The product of its digits is 254016, while the sum is 46.

The square root of 1686161377 is about 41062.8953801361. The cubic root of 1686161377 is about 1190.2359010237.

The spelling of 1686161377 in words is "one billion, six hundred eighty-six million, one hundred sixty-one thousand, three hundred seventy-seven".