1225544616 has 48 divisors (see below), whose sum is σ = 3350224800. Its totient is φ = 404694432.

The previous prime is 1225544587. The next prime is 1225544623. The reversal of 1225544616 is 6164455221.

1225544616 is a `hidden beast` number, since 12 + 25 + 5 + 4 + 4 + 616 = 666.

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

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, 71836 + ... + 87243.

It is an arithmetic number, because the mean of its divisors is an integer number (69796350).

Almost surely, 2^1225544616 is an apocalyptic number.

It is an amenable number.

1225544616 is an abundant number, since it is smaller than the sum of its proper divisors (2124680184).

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

1225544616 is a wasteful number, since it uses less digits than its factorization.

1225544616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159198 (or 159191 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1225544616 is about 35007.7793640214. The cubic root of 1225544616 is about 1070.1460236848.

Adding to 1225544616 its reverse (6164455221), we get a palindrome (7389999837).

The spelling of 1225544616 in words is "one billion, two hundred twenty-five million, five hundred forty-four thousand, six hundred sixteen".