687666666786 has 64 divisors (see below), whose sum is σ = 1511352041472. Its totient is φ = 206859600000.

The previous prime is 687666666769. The next prime is 687666666833.

687666666786 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 14736351 + ... + 14782941.

It is an arithmetic number, because the mean of its divisors is an integer number (23614875648).

Almost surely, 2^687666666786 is an apocalyptic number.

687666666786 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

687666666786 is an abundant number, since it is smaller than the sum of its proper divisors (823685374686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687666666786 is a wasteful number, since it uses less digits than its factorization.

687666666786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48239.

The product of its digits is 5267275776, while the sum is 78.

The spelling of 687666666786 in words is "six hundred eighty-seven billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred eighty-six".