9945973172 has 12 divisors (see below), whose sum is σ = 17520722016. Its totient is φ = 4940052600.

The previous prime is 9945973171. The next prime is 9945973189. The reversal of 9945973172 is 2713795499.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945973171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8232818 + ... + 8234025.

It is an arithmetic number, because the mean of its divisors is an integer number (1460060168).

Almost surely, 2^9945973172 is an apocalyptic number.

It is an amenable number.

9945973172 is a deficient number, since it is larger than the sum of its proper divisors (7574748844).

9945973172 is a wasteful number, since it uses less digits than its factorization.

9945973172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16466998 (or 16466996 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 56.

The square root of 9945973172 is about 99729.5000087737. The cubic root of 9945973172 is about 2150.5477725965.

The spelling of 9945973172 in words is "nine billion, nine hundred forty-five million, nine hundred seventy-three thousand, one hundred seventy-two".