66047507 has 4 divisors (see below), whose sum is σ = 66212616. Its totient is φ = 65882400.

The previous prime is 66047497. The next prime is 66047521. The reversal of 66047507 is 70574066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70574066 = 2 ⋅35287033.

It is a cyclic number.

It is not a de Polignac number, because 66047507 - 2⁸ = 66047251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66049507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81953 + ... + 82754.

It is an arithmetic number, because the mean of its divisors is an integer number (16553154).

Almost surely, 2^66047507 is an apocalyptic number.

66047507 is a deficient number, since it is larger than the sum of its proper divisors (165109).

66047507 is a wasteful number, since it uses less digits than its factorization.

66047507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165108.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 66047507 is about 8126.9617324065. The cubic root of 66047507 is about 404.2209420338.

The spelling of 66047507 in words is "sixty-six million, forty-seven thousand, five hundred seven".