1222665525 has 36 divisors (see below), whose sum is σ = 2198179620. Its totient is φ = 649632000.

The previous prime is 1222665497. The next prime is 1222665527. The reversal of 1222665525 is 5255662221.

1222665525 is a `hidden beast` number, since 122 + 2 + 6 + 6 + 5 + 525 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 620159409 + 602506116 = 24903^2 + 24546^2 .

It is not a de Polignac number, because 1222665525 - 2⁶ = 1222665461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222665525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222665527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50425 + ... + 70625.

It is an arithmetic number, because the mean of its divisors is an integer number (61060545).

Almost surely, 2^1222665525 is an apocalyptic number.

1222665525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1222665525 is a deficient number, since it is larger than the sum of its proper divisors (975514095).

1222665525 is a wasteful number, since it uses less digits than its factorization.

1222665525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20486 (or 20478 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 1222665525 is about 34966.6344534329. The cubic root of 1222665525 is about 1069.3073588171.

The spelling of 1222665525 in words is "one billion, two hundred twenty-two million, six hundred sixty-five thousand, five hundred twenty-five".