1687018666856 has 64 divisors (see below), whose sum is σ = 3353711921280. Its totient is φ = 792829255680.

The previous prime is 1687018666841. The next prime is 1687018666867. The reversal of 1687018666856 is 6586668107861.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533358731 + ... + 533361893.

It is an arithmetic number, because the mean of its divisors is an integer number (52401748770).

Almost surely, 2^{1687018666856} is an apocalyptic number.

It is an amenable number.

1687018666856 is a deficient number, since it is larger than the sum of its proper divisors (1666693254424).

1687018666856 is a wasteful number, since it uses less digits than its factorization.

1687018666856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7194 (or 7190 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 68.

The spelling of 1687018666856 in words is "one trillion, six hundred eighty-seven billion, eighteen million, six hundred sixty-six thousand, eight hundred fifty-six".