1225661256 has 48 divisors (see below), whose sum is σ = 3321115200. Its totient is φ = 408354912.

The previous prime is 1225661243. The next prime is 1225661309. The reversal of 1225661256 is 6521665221.

1225661256 is a `hidden beast` number, since 12 + 25 + 6 + 612 + 5 + 6 = 666.

It is a super-3 number, since 3×1225661256³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1225661256.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268965 + ... + 273483.

It is an arithmetic number, because the mean of its divisors is an integer number (69189900).

Almost surely, 2^1225661256 is an apocalyptic number.

It is an amenable number.

1225661256 is an abundant number, since it is smaller than the sum of its proper divisors (2095453944).

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

1225661256 is a wasteful number, since it uses less digits than its factorization.

1225661256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298 (or 8291 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1225661256 is about 35009.4452398206. The cubic root of 1225661256 is about 1070.1799726386.

The spelling of 1225661256 in words is "one billion, two hundred twenty-five million, six hundred sixty-one thousand, two hundred fifty-six".