66406245 has 8 divisors (see below), whose sum is σ = 106250016. Its totient is φ = 35416656.

The previous prime is 66406243. The next prime is 66406261. The reversal of 66406245 is 54260466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66406245 - 2¹ = 66406243 is a prime.

It is a super-4 number, since 4×66406245⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66406243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213527 + ... + 2213556.

It is an arithmetic number, because the mean of its divisors is an integer number (13281252).

Almost surely, 2^66406245 is an apocalyptic number.

It is an amenable number.

66406245 is a deficient number, since it is larger than the sum of its proper divisors (39843771).

66406245 is a wasteful number, since it uses less digits than its factorization.

66406245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427091.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 66406245 is about 8149.0026997173. The cubic root of 66406245 is about 404.9514649962.

The spelling of 66406245 in words is "sixty-six million, four hundred six thousand, two hundred forty-five".