2256335156421 has 6 divisors (see below), whose sum is σ = 3259150781510. Its totient is φ = 1504223437608.

The previous prime is 2256335156419. The next prime is 2256335156459. The reversal of 2256335156421 is 1246515336522.

2256335156421 is a `hidden beast` number, since 2 + 2 + 5 + 6 + 33 + 51 + 564 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1146957463521 + 1109377692900 = 1070961^2 + 1053270^2 .

It is not a de Polignac number, because 2256335156421 - 2¹ = 2256335156419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256335256421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125351953126 + ... + 125351953143.

Almost surely, 2^{2256335156421} is an apocalyptic number.

It is an amenable number.

2256335156421 is a deficient number, since it is larger than the sum of its proper divisors (1002815625089).

2256335156421 is a wasteful number, since it uses less digits than its factorization.

2256335156421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250703906275 (or 250703906272 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The spelling of 2256335156421 in words is "two trillion, two hundred fifty-six billion, three hundred thirty-five million, one hundred fifty-six thousand, four hundred twenty-one".