65811225 has 24 divisors (see below), whose sum is σ = 109046592. Its totient is φ = 35022400.

The previous prime is 65811223. The next prime is 65811227. The reversal of 65811225 is 52211856.

It is an interprime number because it is at equal distance from previous prime (65811223) and next prime (65811227).

It is not a de Polignac number, because 65811225 - 2¹ = 65811223 is a prime.

It is a super-2 number, since 2×65811225² = 8662234672001250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65811192 and 65811201.

It is not an unprimeable number, because it can be changed into a prime (65811223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55135 + ... + 56315.

It is an arithmetic number, because the mean of its divisors is an integer number (4543608).

Almost surely, 2^65811225 is an apocalyptic number.

It is an amenable number.

65811225 is a deficient number, since it is larger than the sum of its proper divisors (43235367).

65811225 is a wasteful number, since it uses less digits than its factorization.

65811225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1932 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 65811225 is about 8112.4117868856. The cubic root of 65811225 is about 403.7383386357.

The spelling of 65811225 in words is "sixty-five million, eight hundred eleven thousand, two hundred twenty-five".