66644854 has 8 divisors (see below), whose sum is σ = 103192128. Its totient is φ = 32247480.

The previous prime is 66644849. The next prime is 66644861. The reversal of 66644854 is 45844666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66644854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537397 + ... + 537520.

It is an arithmetic number, because the mean of its divisors is an integer number (12899016).

Almost surely, 2^66644854 is an apocalyptic number.

66644854 is a deficient number, since it is larger than the sum of its proper divisors (36547274).

66644854 is a wasteful number, since it uses less digits than its factorization.

66644854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074950.

The product of its digits is 552960, while the sum is 43.

The square root of 66644854 is about 8163.6299524170. The cubic root of 66644854 is about 405.4359051993.

The spelling of 66644854 in words is "sixty-six million, six hundred forty-four thousand, eight hundred fifty-four".