99944400656 has 10 divisors (see below), whose sum is σ = 193642276302. Its totient is φ = 49972200320.

The previous prime is 99944400649. The next prime is 99944400659. The reversal of 99944400656 is 65600444999.

It can be written as a sum of positive squares in only one way, i.e., 81796000000 + 18148400656 = 286000^2 + 134716^2 .

It is not an unprimeable number, because it can be changed into a prime (99944400659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3123262505 + ... + 3123262536.

Almost surely, 2^99944400656 is an apocalyptic number.

It is an amenable number.

99944400656 is a deficient number, since it is larger than the sum of its proper divisors (93697875646).

99944400656 is a wasteful number, since it uses less digits than its factorization.

99944400656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6246525049 (or 6246525043 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 56.

The spelling of 99944400656 in words is "ninety-nine billion, nine hundred forty-four million, four hundred thousand, six hundred fifty-six".