65661224 has 16 divisors (see below), whose sum is σ = 127086720. Its totient is φ = 31771440.

The previous prime is 65661221. The next prime is 65661247. The reversal of 65661224 is 42216656.

It is a super-2 number, since 2×65661224² = 8622792674356352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65661221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132134 + ... + 132629.

It is an arithmetic number, because the mean of its divisors is an integer number (7942920).

Almost surely, 2^65661224 is an apocalyptic number.

It is an amenable number.

65661224 is a deficient number, since it is larger than the sum of its proper divisors (61425496).

65661224 is a wasteful number, since it uses less digits than its factorization.

65661224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264800 (or 264796 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 65661224 is about 8103.1613583835. The cubic root of 65661224 is about 403.4313635239.

The spelling of 65661224 in words is "sixty-five million, six hundred sixty-one thousand, two hundred twenty-four".