9990660901 has 16 divisors (see below), whose sum is σ = 10804147200. Its totient is φ = 9183679488.

The previous prime is 9990660887. The next prime is 9990660907. The reversal of 9990660901 is 1090660999.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 9990660901 - 2¹⁹ = 9990136613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990660907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5678860 + ... + 5680618.

It is an arithmetic number, because the mean of its divisors is an integer number (675259200).

Almost surely, 2^9990660901 is an apocalyptic number.

It is an amenable number.

9990660901 is a deficient number, since it is larger than the sum of its proper divisors (813486299).

9990660901 is a wasteful number, since it uses less digits than its factorization.

9990660901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 9990660901 is about 99953.2935975599. The cubic root of 9990660901 is about 2153.7637985091.

The spelling of 9990660901 in words is "nine billion, nine hundred ninety million, six hundred sixty thousand, nine hundred one".