1686478875249 has 16 divisors (see below), whose sum is σ = 2571605507072. Its totient is φ = 963052363728.

The previous prime is 1686478875233. The next prime is 1686478875269. The reversal of 1686478875249 is 9425788746861.

It is not a de Polignac number, because 1686478875249 - 2⁴ = 1686478875233 is a prime.

It is a super-2 number, since 2×1686478875249² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1686478875269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27045229 + ... + 27107514.

It is an arithmetic number, because the mean of its divisors is an integer number (160725344192).

Almost surely, 2^{1686478875249} is an apocalyptic number.

It is an amenable number.

1686478875249 is a deficient number, since it is larger than the sum of its proper divisors (885126631823).

1686478875249 is a wasteful number, since it uses less digits than its factorization.

1686478875249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54154236.

The product of its digits is 1300561920, while the sum is 75.

The spelling of 1686478875249 in words is "one trillion, six hundred eighty-six billion, four hundred seventy-eight million, eight hundred seventy-five thousand, two hundred forty-nine".