86943905621 has 16 divisors (see below), whose sum is σ = 89843281920. Its totient is φ = 84096907440.

The previous prime is 86943905567. The next prime is 86943905623. The reversal of 86943905621 is 12650934968.

It is a cyclic number.

It is not a de Polignac number, because 86943905621 - 2¹⁸ = 86943643477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86943905623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2086436 + ... + 2127698.

It is an arithmetic number, because the mean of its divisors is an integer number (5615205120).

Almost surely, 2^86943905621 is an apocalyptic number.

It is an amenable number.

86943905621 is a deficient number, since it is larger than the sum of its proper divisors (2899376299).

86943905621 is a wasteful number, since it uses less digits than its factorization.

86943905621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41896.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 86943905621 in words is "eighty-six billion, nine hundred forty-three million, nine hundred five thousand, six hundred twenty-one".