616661325 has 54 divisors (see below), whose sum is σ = 1284859914. Its totient is φ = 281897280.

The previous prime is 616661317. The next prime is 616661329. The reversal of 616661325 is 523166616.

It can be written as a sum of positive squares in 3 ways, for example, as 5731236 + 610930089 = 2394^2 + 24717^2 .

It is not a de Polignac number, because 616661325 - 2³ = 616661317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616661325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616661329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 16942 + ... + 38991.

Almost surely, 2^616661325 is an apocalyptic number.

It is an amenable number.

616661325 is an abundant number, since it is smaller than the sum of its proper divisors (668198589).

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

616661325 is a wasteful number, since it uses less digits than its factorization.

616661325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55963 (or 55948 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 616661325 is about 24832.6664899281. Note that the first 3 decimals coincide. The cubic root of 616661325 is about 851.1685542472.

The spelling of 616661325 in words is "six hundred sixteen million, six hundred sixty-one thousand, three hundred twenty-five".