66441535 has 4 divisors (see below), whose sum is σ = 79729848. Its totient is φ = 53153224.

The previous prime is 66441533. The next prime is 66441539. The reversal of 66441535 is 53514466.

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

It is a cyclic number.

It is not a de Polignac number, because 66441535 - 2¹ = 66441533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66441535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66441533) 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, 6644149 + ... + 6644158.

It is an arithmetic number, because the mean of its divisors is an integer number (19932462).

Almost surely, 2^66441535 is an apocalyptic number.

66441535 is a deficient number, since it is larger than the sum of its proper divisors (13288313).

66441535 is a wasteful number, since it uses less digits than its factorization.

66441535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13288312.

The product of its digits is 43200, while the sum is 34.

The square root of 66441535 is about 8151.1677077582. The cubic root of 66441535 is about 405.0231861948.

The spelling of 66441535 in words is "sixty-six million, four hundred forty-one thousand, five hundred thirty-five".