1686438888465 has 8 divisors (see below), whose sum is σ = 2698302221568. Its totient is φ = 899434073840.

The previous prime is 1686438888439. The next prime is 1686438888499. The reversal of 1686438888465 is 5648888346861.

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

It is not a de Polignac number, because 1686438888465 - 2⁸ = 1686438888209 is a prime.

It is a super-2 number, since 2×1686438888465² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56214629601 + ... + 56214629630.

It is an arithmetic number, because the mean of its divisors is an integer number (337287777696).

Almost surely, 2^{1686438888465} is an apocalyptic number.

1686438888465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1686438888465 is a deficient number, since it is larger than the sum of its proper divisors (1011863333103).

1686438888465 is a wasteful number, since it uses less digits than its factorization.

1686438888465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112429259239.

The product of its digits is 1698693120, while the sum is 75.

The spelling of 1686438888465 in words is "one trillion, six hundred eighty-six billion, four hundred thirty-eight million, eight hundred eighty-eight thousand, four hundred sixty-five".