99866720506 has 16 divisors (see below), whose sum is σ = 171304713216. Its totient is φ = 42773867856.

The previous prime is 99866720479. The next prime is 99866720543. The reversal of 99866720506 is 60502766899.

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, 2155866 + ... + 2201701.

It is an arithmetic number, because the mean of its divisors is an integer number (10706544576).

Almost surely, 2^99866720506 is an apocalyptic number.

99866720506 is a deficient number, since it is larger than the sum of its proper divisors (71437992710).

99866720506 is a wasteful number, since it uses less digits than its factorization.

99866720506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359213.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 99866720506 in words is "ninety-nine billion, eight hundred sixty-six million, seven hundred twenty thousand, five hundred six".