616636025 has 6 divisors (see below), whose sum is σ = 764628702. Its totient is φ = 493308800.

The previous prime is 616635997. The next prime is 616636061. The reversal of 616636025 is 520636616.

It can be written as a sum of positive squares in 3 ways, for example, as 133911184 + 482724841 = 11572^2 + 21971^2 .

It is not a de Polignac number, because 616636025 - 2⁸ = 616635769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12332696 + ... + 12332745.

It is an arithmetic number, because the mean of its divisors is an integer number (127438117).

Almost surely, 2^616636025 is an apocalyptic number.

It is an amenable number.

616636025 is a deficient number, since it is larger than the sum of its proper divisors (147992677).

616636025 is a wasteful number, since it uses less digits than its factorization.

616636025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24665451 (or 24665446 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 616636025 is about 24832.1570750509. The cubic root of 616636025 is about 851.1569136821.

The spelling of 616636025 in words is "six hundred sixteen million, six hundred thirty-six thousand, twenty-five".