66441547 has 4 divisors (see below), whose sum is σ = 66465616. Its totient is φ = 66417480.

The previous prime is 66441541. The next prime is 66441553. The reversal of 66441547 is 74514466.

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

It is an interprime number because it is at equal distance from previous prime (66441541) and next prime (66441553).

It is a cyclic number.

It is not a de Polignac number, because 66441547 - 2³ = 66441539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66441541) 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, 7263 + ... + 13624.

It is an arithmetic number, because the mean of its divisors is an integer number (16616404).

Almost surely, 2^66441547 is an apocalyptic number.

66441547 is a deficient number, since it is larger than the sum of its proper divisors (24069).

66441547 is a wasteful number, since it uses less digits than its factorization.

66441547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24068.

The product of its digits is 80640, while the sum is 37.

The square root of 66441547 is about 8151.1684438490. The cubic root of 66441547 is about 405.0232105785.

The spelling of 66441547 in words is "sixty-six million, four hundred forty-one thousand, five hundred forty-seven".