65615225 has 12 divisors (see below), whose sum is σ = 87621996. Its totient is φ = 48454080.

The previous prime is 65615213. The next prime is 65615233. The reversal of 65615225 is 52251656.

It can be written as a sum of positive squares in 6 ways, for example, as 21631801 + 43983424 = 4651^2 + 6632^2 .

It is not a de Polignac number, because 65615225 - 2²² = 61420921 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65615191 and 65615200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100622 + ... + 101271.

It is an arithmetic number, because the mean of its divisors is an integer number (7301833).

Almost surely, 2^65615225 is an apocalyptic number.

65615225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65615225 is a deficient number, since it is larger than the sum of its proper divisors (22006771).

65615225 is a wasteful number, since it uses less digits than its factorization.

65615225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201916 (or 201911 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 65615225 is about 8100.3225244431. The cubic root of 65615225 is about 403.3371335085.

The spelling of 65615225 in words is "sixty-five million, six hundred fifteen thousand, two hundred twenty-five".