99772231808 has 24 divisors (see below), whose sum is σ = 198772112655. Its totient is φ = 49884329088.

The previous prime is 99772231799. The next prime is 99772231831. The reversal of 99772231808 is 80813227799.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 49886115904 + 49886115904 = 223352^2 + 223352^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=223352.

It is a Duffinian number.

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 2 ways as a sum of consecutive naturals, for example, 3559673 + ... + 3587591.

Almost surely, 2^99772231808 is an apocalyptic number.

It is an amenable number.

99772231808 is a deficient number, since it is larger than the sum of its proper divisors (98999880847).

99772231808 is an frugal number, since it uses more digits than its factorization.

99772231808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55852 (or 27921 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 99772231808 in words is "ninety-nine billion, seven hundred seventy-two million, two hundred thirty-one thousand, eight hundred eight".