2156253800866 has 24 divisors (see below), whose sum is σ = 3555261123120. Its totient is φ = 980083551480.

The previous prime is 2156253800849. The next prime is 2156253800881. The reversal of 2156253800866 is 6680083526512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8357205 + ... + 8611351.

It is an arithmetic number, because the mean of its divisors is an integer number (148135880130).

Almost surely, 2^{2156253800866} is an apocalyptic number.

2156253800866 is a deficient number, since it is larger than the sum of its proper divisors (1399007322254).

2156253800866 is a wasteful number, since it uses less digits than its factorization.

2156253800866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289230 (or 289219 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 2156253800866 in words is "two trillion, one hundred fifty-six billion, two hundred fifty-three million, eight hundred thousand, eight hundred sixty-six".