9999980076645 has 48 divisors (see below), whose sum is σ = 18668269855872. Its totient is φ = 4922634487680.

The previous prime is 9999980076523. The next prime is 9999980076659. The reversal of 9999980076645 is 5466700899999.

It is not a de Polignac number, because 9999980076645 - 2²³ = 9999971688037 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5962840 + ... + 7453550.

It is an arithmetic number, because the mean of its divisors is an integer number (388922288664).

Almost surely, 2^{9999980076645} is an apocalyptic number.

It is an amenable number.

9999980076645 is a deficient number, since it is larger than the sum of its proper divisors (8668289779227).

9999980076645 is a wasteful number, since it uses less digits than its factorization.

9999980076645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502202 (or 1502199 counting only the distinct ones).

The product of its (nonzero) digits is 2380855680, while the sum is 81.

The spelling of 9999980076645 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred eighty million, seventy-six thousand, six hundred forty-five".