1281656825228 has 12 divisors (see below), whose sum is σ = 2415430170720. Its totient is φ = 591533919312.

The previous prime is 1281656825219. The next prime is 1281656825257. The reversal of 1281656825228 is 8225286561821.

It is a super-2 number, since 2×1281656825228² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12323623268 + ... + 12323623371.

It is an arithmetic number, because the mean of its divisors is an integer number (201285847560).

Almost surely, 2^{1281656825228} is an apocalyptic number.

It is an amenable number.

1281656825228 is a deficient number, since it is larger than the sum of its proper divisors (1133773345492).

1281656825228 is a wasteful number, since it uses less digits than its factorization.

1281656825228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24647246656 (or 24647246654 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 56.

The spelling of 1281656825228 in words is "one trillion, two hundred eighty-one billion, six hundred fifty-six million, eight hundred twenty-five thousand, two hundred twenty-eight".