66630547 has 4 divisors (see below), whose sum is σ = 66841056. Its totient is φ = 66420040.

The previous prime is 66630539. The next prime is 66630559. The reversal of 66630547 is 74503666.

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 66630547 - 2³ = 66630539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66630847) 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, 104779 + ... + 105412.

It is an arithmetic number, because the mean of its divisors is an integer number (16710264).

Almost surely, 2^66630547 is an apocalyptic number.

66630547 is a deficient number, since it is larger than the sum of its proper divisors (210509).

66630547 is a wasteful number, since it uses less digits than its factorization.

66630547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210508.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 66630547 is about 8162.7536407759. The cubic root of 66630547 is about 405.4068907730.

It can be divided in two parts, 666 and 30547, that multiplied together give a palindrome (20344302).

The spelling of 66630547 in words is "sixty-six million, six hundred thirty thousand, five hundred forty-seven".