2156880672345 has 96 divisors (see below), whose sum is σ = 4101023582208. Its totient is φ = 964748249472.

The previous prime is 2156880672293. The next prime is 2156880672361. The reversal of 2156880672345 is 5432760886512.

It is not a de Polignac number, because 2156880672345 - 2⁷ = 2156880672217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 165360394 + ... + 165373436.

It is an arithmetic number, because the mean of its divisors is an integer number (42718995648).

Almost surely, 2^{2156880672345} is an apocalyptic number.

It is an amenable number.

2156880672345 is a deficient number, since it is larger than the sum of its proper divisors (1944142909863).

2156880672345 is a wasteful number, since it uses less digits than its factorization.

2156880672345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17899 (or 17892 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 57.

The spelling of 2156880672345 in words is "two trillion, one hundred fifty-six billion, eight hundred eighty million, six hundred seventy-two thousand, three hundred forty-five".