2156225265768 has 32 divisors (see below), whose sum is σ = 6160643616960. Its totient is φ = 616064361600.

The previous prime is 2156225265767. The next prime is 2156225265769. The reversal of 2156225265768 is 8675625226512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2156225265767) and next prime (2156225265769).

It is not an unprimeable number, because it can be changed into a prime (2156225265767) 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, 6417336933 + ... + 6417337268.

It is an arithmetic number, because the mean of its divisors is an integer number (192520113030).

Almost surely, 2^{2156225265768} is an apocalyptic number.

2156225265768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2156225265768 is an abundant number, since it is smaller than the sum of its proper divisors (4004418351192).

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

2156225265768 is a wasteful number, since it uses less digits than its factorization.

2156225265768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12834674217 (or 12834674213 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 57.

The spelling of 2156225265768 in words is "two trillion, one hundred fifty-six billion, two hundred twenty-five million, two hundred sixty-five thousand, seven hundred sixty-eight".