9975954921 has 8 divisors (see below), whose sum is σ = 14001340320. Its totient is φ = 6300603072.

The previous prime is 9975954917. The next prime is 9975954949. The reversal of 9975954921 is 1294595799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9975954921 - 2² = 9975954917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9975954971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87508320 + ... + 87508433.

It is an arithmetic number, because the mean of its divisors is an integer number (1750167540).

Almost surely, 2^9975954921 is an apocalyptic number.

It is an amenable number.

9975954921 is a deficient number, since it is larger than the sum of its proper divisors (4025385399).

9975954921 is a wasteful number, since it uses less digits than its factorization.

9975954921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175016775.

The product of its digits is 9185400, while the sum is 60.

The square root of 9975954921 is about 99879.7022472534. The cubic root of 9975954921 is about 2152.7065190799.

The spelling of 9975954921 in words is "nine billion, nine hundred seventy-five million, nine hundred fifty-four thousand, nine hundred twenty-one".