9999854857356 has 96 divisors (see below), whose sum is σ = 28722226003968. Its totient is φ = 2636893267200.

The previous prime is 9999854857331. The next prime is 9999854857373. The reversal of 9999854857356 is 6537584589999.

It is a happy number.

9999854857356 is a nontrivial binomial coefficient, being equal to C(4472104, 2).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5962806 + ... + 7453506.

It is an arithmetic number, because the mean of its divisors is an integer number (299189854208).

Almost surely, 2^{9999854857356} is an apocalyptic number.

9999854857356 is the 4472103-rd triangular number and also the 2236052-nd hexagonal number.

It is an amenable number.

9999854857356 is an abundant number, since it is smaller than the sum of its proper divisors (18722371146612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999854857356 is a wasteful number, since it uses less digits than its factorization.

9999854857356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496871 (or 1496869 counting only the distinct ones).

The product of its digits is 26453952000, while the sum is 87.

The spelling of 9999854857356 in words is "nine trillion, nine hundred ninety-nine billion, eight hundred fifty-four million, eight hundred fifty-seven thousand, three hundred fifty-six".