99217146778 has 32 divisors (see below), whose sum is σ = 152250192000. Its totient is φ = 48482168064.

The previous prime is 99217146719. The next prime is 99217146803. The reversal of 99217146778 is 87764171299.

It is an unprimeable number.

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, 8698323 + ... + 8709721.

It is an arithmetic number, because the mean of its divisors is an integer number (4757818500).

Almost surely, 2^99217146778 is an apocalyptic number.

99217146778 is a deficient number, since it is larger than the sum of its proper divisors (53033045222).

99217146778 is a wasteful number, since it uses less digits than its factorization.

99217146778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12054.

The product of its digits is 10668672, while the sum is 61.

The spelling of 99217146778 in words is "ninety-nine billion, two hundred seventeen million, one hundred forty-six thousand, seven hundred seventy-eight".