65437618 has 4 divisors (see below), whose sum is σ = 98156430. Its totient is φ = 32718808.

The previous prime is 65437613. The next prime is 65437633. The reversal of 65437618 is 81673456.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45927729 + 19509889 = 6777^2 + 4417^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (65437613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16359403 + ... + 16359406.

Almost surely, 2^65437618 is an apocalyptic number.

65437618 is a deficient number, since it is larger than the sum of its proper divisors (32718812).

65437618 is a wasteful number, since it uses less digits than its factorization.

65437618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32718811.

The product of its digits is 120960, while the sum is 40.

The square root of 65437618 is about 8089.3521372234. The cubic root of 65437618 is about 402.9728876095.

It can be divided in two parts, 6543 and 7618, that added together give a square (14161 = 119²).

The spelling of 65437618 in words is "sixty-five million, four hundred thirty-seven thousand, six hundred eighteen".