84663986640 has 80 divisors (see below), whose sum is σ = 262488640128. Its totient is φ = 22574458368.

The previous prime is 84663986621. The next prime is 84663986657. The reversal of 84663986640 is 4668936648.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

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, 2989989 + ... + 3018171.

Almost surely, 2^84663986640 is an apocalyptic number.

84663986640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84663986640 is an abundant number, since it is smaller than the sum of its proper divisors (177824653488).

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

84663986640 is a wasteful number, since it uses less digits than its factorization.

84663986640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40716 (or 40710 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 60.

The spelling of 84663986640 in words is "eighty-four billion, six hundred sixty-three million, nine hundred eighty-six thousand, six hundred forty".