5661810025 has 27 divisors (see below), whose sum is σ = 7138752943. Its totient is φ = 4454504000.

The previous prime is 5661810001. The next prime is 5661810059. The reversal of 5661810025 is 5200181665.

It is a happy number.

The square root of 5661810025 is 75245.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 2784989529 + 2876820496 = 52773^2 + 53636^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5661810025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37998651 + ... + 37998799.

Almost surely, 2^5661810025 is an apocalyptic number.

5661810025 is the 75245-th square number.

5661810025 is the 37623-rd centered octagonal number.

It is an amenable number.

5661810025 is a deficient number, since it is larger than the sum of its proper divisors (1476942918).

5661810025 is an equidigital number, since it uses as much as digits as its factorization.

5661810025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The cubic root of 5661810025 is about 1782.3176082320.

Multiplying 5661810025 by its product of nonzero digits (14400), we get a square (81530064360000 = 9029400²).

The spelling of 5661810025 in words is "five billion, six hundred sixty-one million, eight hundred ten thousand, twenty-five".