2991271850856 has 32 divisors (see below), whose sum is σ = 8309088475200. Its totient is φ = 997090616880.

The previous prime is 2991271850843. The next prime is 2991271850857. The reversal of 2991271850856 is 6580581721992.

2991271850856 is a `hidden beast` number, since 2 + 9 + 9 + 1 + 2 + 71 + 8 + 508 + 56 = 666.

2991271850856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2991271850793 and 2991271850802.

It is not an unprimeable number, because it can be changed into a prime (2991271850857) 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, 6924240180 + ... + 6924240611.

It is an arithmetic number, because the mean of its divisors is an integer number (259659014850).

Almost surely, 2^{2991271850856} is an apocalyptic number.

It is an amenable number.

2991271850856 is an abundant number, since it is smaller than the sum of its proper divisors (5317816624344).

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

2991271850856 is a wasteful number, since it uses less digits than its factorization.

2991271850856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13848480806 (or 13848480796 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 63.

The spelling of 2991271850856 in words is "two trillion, nine hundred ninety-one billion, two hundred seventy-one million, eight hundred fifty thousand, eight hundred fifty-six".