1225551565 has 16 divisors (see below), whose sum is σ = 1682174592. Its totient is φ = 839669184.

The previous prime is 1225551533. The next prime is 1225551583. The reversal of 1225551565 is 5651555221.

It is a cyclic number.

It is not a de Polignac number, because 1225551565 - 2⁵ = 1225551533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29142 + ... + 57448.

It is an arithmetic number, because the mean of its divisors is an integer number (105135912).

Almost surely, 2^1225551565 is an apocalyptic number.

It is an amenable number.

1225551565 is a deficient number, since it is larger than the sum of its proper divisors (456623027).

1225551565 is a wasteful number, since it uses less digits than its factorization.

1225551565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29556.

The product of its digits is 75000, while the sum is 37.

The square root of 1225551565 is about 35007.8786132493. The cubic root of 1225551565 is about 1070.1480463042.

The spelling of 1225551565 in words is "one billion, two hundred twenty-five million, five hundred fifty-one thousand, five hundred sixty-five".