66654243 has 12 divisors (see below), whose sum is σ = 97232928. Its totient is φ = 43995600.

The previous prime is 66654239. The next prime is 66654251. The reversal of 66654243 is 34245666.

It is not a de Polignac number, because 66654243 - 2² = 66654239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66654198 and 66654207.

It is not an unprimeable number, because it can be changed into a prime (66654283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35755 + ... + 37572.

It is an arithmetic number, because the mean of its divisors is an integer number (8102744).

Almost surely, 2^66654243 is an apocalyptic number.

66654243 is a deficient number, since it is larger than the sum of its proper divisors (30578685).

66654243 is a wasteful number, since it uses less digits than its factorization.

66654243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73434 (or 73431 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 66654243 is about 8164.2049827280. The cubic root of 66654243 is about 405.4549437234.

The spelling of 66654243 in words is "sixty-six million, six hundred fifty-four thousand, two hundred forty-three".