66406654 has 8 divisors (see below), whose sum is σ = 99790488. Its totient is φ = 33143160.

The previous prime is 66406643. The next prime is 66406657. The reversal of 66406654 is 45660466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66406657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28692 + ... + 30919.

It is an arithmetic number, because the mean of its divisors is an integer number (12473811).

Almost surely, 2^66406654 is an apocalyptic number.

66406654 is a deficient number, since it is larger than the sum of its proper divisors (33383834).

66406654 is a wasteful number, since it uses less digits than its factorization.

66406654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60170.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 66406654 is about 8149.0277947740. The cubic root of 66406654 is about 404.9522963679.

The spelling of 66406654 in words is "sixty-six million, four hundred six thousand, six hundred fifty-four".