2256138168 has 32 divisors (see below), whose sum is σ = 5724533760. Its totient is φ = 740820960.

The previous prime is 2256138167. The next prime is 2256138193. The reversal of 2256138168 is 8618316522.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256138167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699928 + ... + 703143.

It is an arithmetic number, because the mean of its divisors is an integer number (178891680).

Almost surely, 2^2256138168 is an apocalyptic number.

It is an amenable number.

2256138168 is an abundant number, since it is smaller than the sum of its proper divisors (3468395592).

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

2256138168 is a wasteful number, since it uses less digits than its factorization.

2256138168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403147 (or 1403143 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 2256138168 is about 47498.8228064654. The cubic root of 2256138168 is about 1311.5612115234.

The spelling of 2256138168 in words is "two billion, two hundred fifty-six million, one hundred thirty-eight thousand, one hundred sixty-eight".