66665149 has 8 divisors (see below), whose sum is σ = 68312160. Its totient is φ = 65032656.

The previous prime is 66665147. The next prime is 66665161. The reversal of 66665149 is 94156666.

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

It is a cyclic number.

It is not a de Polignac number, because 66665149 - 2¹ = 66665147 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 (66665147) 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, 5974 + ... + 13000.

It is an arithmetic number, because the mean of its divisors is an integer number (8539020).

Almost surely, 2^66665149 is an apocalyptic number.

It is an amenable number.

66665149 is a deficient number, since it is larger than the sum of its proper divisors (1647011).

66665149 is a wasteful number, since it uses less digits than its factorization.

66665149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259.

The product of its digits is 233280, while the sum is 43.

The square root of 66665149 is about 8164.8728710250. The cubic root of 66665149 is about 405.4770560965.

It can be divided in two parts, 66 and 665149, that multiplied together give a palindrome (43899834).

The spelling of 66665149 in words is "sixty-six million, six hundred sixty-five thousand, one hundred forty-nine".