9980870985 has 24 divisors (see below), whose sum is σ = 17896736520. Its totient is φ = 5139574272.

The previous prime is 9980870951. The next prime is 9980870993. The reversal of 9980870985 is 5890780899.

It can be written as a sum of positive squares in 4 ways, for example, as 53538489 + 9927332496 = 7317^2 + 99636^2 .

It is not a de Polignac number, because 9980870985 - 2⁸ = 9980870729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3822784 + ... + 3825393.

It is an arithmetic number, because the mean of its divisors is an integer number (745697355).

Almost surely, 2^9980870985 is an apocalyptic number.

It is an amenable number.

9980870985 is a deficient number, since it is larger than the sum of its proper divisors (7915865535).

9980870985 is a wasteful number, since it uses less digits than its factorization.

9980870985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7648217 (or 7648214 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 63.

The square root of 9980870985 is about 99904.3091412978. The cubic root of 9980870985 is about 2153.0600727063.

The spelling of 9980870985 in words is "nine billion, nine hundred eighty million, eight hundred seventy thousand, nine hundred eighty-five".