9959221672 has 8 divisors (see below), whose sum is σ = 18673540650. Its totient is φ = 4979610832.

The previous prime is 9959221667. The next prime is 9959221693. The reversal of 9959221672 is 2761229599.

It can be written as a sum of positive squares in only one way, i.e., 8050755076 + 1908466596 = 89726^2 + 43686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622451347 + ... + 622451362.

Almost surely, 2^9959221672 is an apocalyptic number.

It is an amenable number.

9959221672 is a deficient number, since it is larger than the sum of its proper divisors (8714318978).

9959221672 is a wasteful number, since it uses less digits than its factorization.

9959221672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244902715 (or 1244902711 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 52.

The square root of 9959221672 is about 99795.9000761053. The cubic root of 9959221672 is about 2151.5022255643.

The spelling of 9959221672 in words is "nine billion, nine hundred fifty-nine million, two hundred twenty-one thousand, six hundred seventy-two".