66550507 has 4 divisors (see below), whose sum is σ = 66568320. Its totient is φ = 66532696.

The previous prime is 66550499. The next prime is 66550513. The reversal of 66550507 is 70505566.

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 66550507 - 2³ = 66550499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66550537) 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, 907 + ... + 11572.

It is an arithmetic number, because the mean of its divisors is an integer number (16642080).

Almost surely, 2^66550507 is an apocalyptic number.

66550507 is a deficient number, since it is larger than the sum of its proper divisors (17813).

66550507 is a wasteful number, since it uses less digits than its factorization.

66550507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17812.

The product of its (nonzero) digits is 31500, while the sum is 34.

The square root of 66550507 is about 8157.8494102306. The cubic root of 66550507 is about 405.2444939409.

The spelling of 66550507 in words is "sixty-six million, five hundred fifty thousand, five hundred seven".