65641537 has 4 divisors (see below), whose sum is σ = 70690900. Its totient is φ = 60592176.

The previous prime is 65641531. The next prime is 65641553. The reversal of 65641537 is 73514656.

65641537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31348801 + 34292736 = 5599^2 + 5856^2 .

It is a cyclic number.

It is not a de Polignac number, because 65641537 - 2¹⁹ = 65117249 is a prime.

It is a super-2 number, since 2×65641537² = 8617622759444738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65641496 and 65641505.

It is not an unprimeable number, because it can be changed into a prime (65641531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2524662 + ... + 2524687.

It is an arithmetic number, because the mean of its divisors is an integer number (17672725).

Almost surely, 2^65641537 is an apocalyptic number.

It is an amenable number.

65641537 is a deficient number, since it is larger than the sum of its proper divisors (5049363).

65641537 is a wasteful number, since it uses less digits than its factorization.

65641537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049362.

The product of its digits is 75600, while the sum is 37.

The square root of 65641537 is about 8101.9464945160. The cubic root of 65641537 is about 403.3910396378.

The spelling of 65641537 in words is "sixty-five million, six hundred forty-one thousand, five hundred thirty-seven".