66656159 has 4 divisors (see below), whose sum is σ = 66683904. Its totient is φ = 66628416.

The previous prime is 66656153. The next prime is 66656179. The reversal of 66656159 is 95165666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66656159 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 (66656153) 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, 9887 + ... + 15200.

It is an arithmetic number, because the mean of its divisors is an integer number (16670976).

Almost surely, 2^66656159 is an apocalyptic number.

66656159 is a deficient number, since it is larger than the sum of its proper divisors (27745).

66656159 is a wasteful number, since it uses less digits than its factorization.

66656159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27744.

The product of its digits is 291600, while the sum is 44.

The square root of 66656159 is about 8164.3223233775. The cubic root of 66656159 is about 405.4588286685.

The spelling of 66656159 in words is "sixty-six million, six hundred fifty-six thousand, one hundred fifty-nine".