87661816678 has 16 divisors (see below), whose sum is σ = 137369788416. Its totient is φ = 41905957320.

The previous prime is 87661816643. The next prime is 87661816703.

87661816678 is nontrivially palindromic in base 10.

It is a congruent number.

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, 8512326 + ... + 8522617.

It is an arithmetic number, because the mean of its divisors is an integer number (8585611776).

Almost surely, 2^87661816678 is an apocalyptic number.

87661816678 is a deficient number, since it is larger than the sum of its proper divisors (49707971738).

87661816678 is a wasteful number, since it uses less digits than its factorization.

87661816678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17035059.

The product of its digits is 32514048, while the sum is 64.

The spelling of 87661816678 in words is "eighty-seven billion, six hundred sixty-one million, eight hundred sixteen thousand, six hundred seventy-eight".