65691025 has 9 divisors (see below), whose sum is σ = 81507153. Its totient is φ = 52520400.

The previous prime is 65690981. The next prime is 65691047. The reversal of 65691025 is 52019656.

It is a happy number.

The square root of 65691025 is 8105.

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 1306449 + 64384576 = 1143^2 + 8024^2 .

It is not a de Polignac number, because 65691025 - 2¹³ = 65682833 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, 39715 + ... + 41335.

Almost surely, 2^65691025 is an apocalyptic number.

65691025 is the 8105-th square number.

65691025 is the 4053-rd centered octagonal number.

It is an amenable number.

65691025 is a deficient number, since it is larger than the sum of its proper divisors (15816128).

65691025 is an frugal number, since it uses more digits than its factorization.

65691025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The cubic root of 65691025 is about 403.4923880725.

The spelling of 65691025 in words is "sixty-five million, six hundred ninety-one thousand, twenty-five".