65610261025 has 9 divisors (see below), whose sum is σ = 81358311801. Its totient is φ = 52487184240.

The previous prime is 65610261019. The next prime is 65610261037. The reversal of 65610261025 is 52016201656.

The square root of 65610261025 is 256145.

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

It can be written as a sum of positive squares in 4 ways, for example, as 15387658209 + 50222602816 = 124047^2 + 224104^2 .

It is not a de Polignac number, because 65610261025 - 2¹⁹ = 65609736737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1255111 + ... + 1306339.

Almost surely, 2^65610261025 is an apocalyptic number.

65610261025 is the 256145-th square number.

65610261025 is the 128073-rd centered octagonal number.

It is an amenable number.

65610261025 is a deficient number, since it is larger than the sum of its proper divisors (15748050776).

65610261025 is an frugal number, since it uses more digits than its factorization.

65610261025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102468 (or 51234 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 65610261025 in words is "sixty-five billion, six hundred ten million, two hundred sixty-one thousand, twenty-five".