2156361968 has 10 divisors (see below), whose sum is σ = 4177951344. Its totient is φ = 1078180976.

The previous prime is 2156361967. The next prime is 2156361971. The reversal of 2156361968 is 8691636512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156361967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67386296 + ... + 67386327.

Almost surely, 2^2156361968 is an apocalyptic number.

It is an amenable number.

2156361968 is a deficient number, since it is larger than the sum of its proper divisors (2021589376).

2156361968 is a wasteful number, since it uses less digits than its factorization.

2156361968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134772631 (or 134772625 counting only the distinct ones).

The product of its digits is 466560, while the sum is 47.

The square root of 2156361968 is about 46436.6446677621. The cubic root of 2156361968 is about 1291.9346744952.

The spelling of 2156361968 in words is "two billion, one hundred fifty-six million, three hundred sixty-one thousand, nine hundred sixty-eight".