1687378908459 has 24 divisors (see below), whose sum is σ = 2287917543600. Its totient is φ = 1106191724160.

The previous prime is 1687378908419. The next prime is 1687378908491. The reversal of 1687378908459 is 9548098737861.

It is not a de Polignac number, because 1687378908459 - 2⁸ = 1687378908203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1687378908419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48530509 + ... + 48565265.

It is an arithmetic number, because the mean of its divisors is an integer number (95329897650).

Almost surely, 2^{1687378908459} is an apocalyptic number.

1687378908459 is a deficient number, since it is larger than the sum of its proper divisors (600538635141).

1687378908459 is an equidigital number, since it uses as much as digits as its factorization.

1687378908459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39231 (or 39170 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 75.

The spelling of 1687378908459 in words is "one trillion, six hundred eighty-seven billion, three hundred seventy-eight million, nine hundred eight thousand, four hundred fifty-nine".