1563618225 has 24 divisors (see below), whose sum is σ = 2784044032. Its totient is φ = 769780800.

The previous prime is 1563618181. The next prime is 1563618241. The reversal of 1563618225 is 5228163651.

It is not a de Polignac number, because 1563618225 - 2¹⁰ = 1563617201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 800881 + ... + 802830.

Almost surely, 2^1563618225 is an apocalyptic number.

1563618225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1563618225 is a deficient number, since it is larger than the sum of its proper divisors (1220425807).

1563618225 is a wasteful number, since it uses less digits than its factorization.

1563618225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603737 (or 1603732 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 1563618225 is about 39542.6127740694. The cubic root of 1563618225 is about 1160.6739605624.

The spelling of 1563618225 in words is "one billion, five hundred sixty-three million, six hundred eighteen thousand, two hundred twenty-five".