66605159 has 4 divisors (see below), whose sum is σ = 67734120. Its totient is φ = 65476200.

The previous prime is 66605117. The next prime is 66605179. The reversal of 66605159 is 95150666.

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 66605159 - 2⁸ = 66604903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605179) 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, 564392 + ... + 564509.

It is an arithmetic number, because the mean of its divisors is an integer number (16933530).

Almost surely, 2^66605159 is an apocalyptic number.

66605159 is a deficient number, since it is larger than the sum of its proper divisors (1128961).

66605159 is a wasteful number, since it uses less digits than its factorization.

66605159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128960.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 66605159 is about 8161.1983801400. The cubic root of 66605159 is about 405.3553939840.

The spelling of 66605159 in words is "sixty-six million, six hundred five thousand, one hundred fifty-nine".