99576643447 has 4 divisors (see below), whose sum is σ = 99632493040. Its totient is φ = 99520793856.

The previous prime is 99576643423. The next prime is 99576643501. The reversal of 99576643447 is 74434667599.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99576643447 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 (99576643147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27922122 + ... + 27925687.

It is an arithmetic number, because the mean of its divisors is an integer number (24908123260).

Almost surely, 2^99576643447 is an apocalyptic number.

99576643447 is a deficient number, since it is larger than the sum of its proper divisors (55849593).

99576643447 is a wasteful number, since it uses less digits than its factorization.

99576643447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55849592.

The product of its digits is 137168640, while the sum is 64.

The spelling of 99576643447 in words is "ninety-nine billion, five hundred seventy-six million, six hundred forty-three thousand, four hundred forty-seven".