66153749 has 8 divisors (see below), whose sum is σ = 70355160. Its totient is φ = 61986816.

The previous prime is 66153701. The next prime is 66153751. The reversal of 66153749 is 94735166.

It can be written as a sum of positive squares in 4 ways, for example, as 21022225 + 45131524 = 4585^2 + 6718^2 .

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 66153749 - 2¹² = 66149653 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 (66153449) 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, 4604 + ... + 12389.

It is an arithmetic number, because the mean of its divisors is an integer number (8794395).

Almost surely, 2^66153749 is an apocalyptic number.

It is an amenable number.

66153749 is a deficient number, since it is larger than the sum of its proper divisors (4201411).

66153749 is a wasteful number, since it uses less digits than its factorization.

66153749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17239.

The product of its digits is 136080, while the sum is 41.

The square root of 66153749 is about 8133.4954970173. The cubic root of 66153749 is about 404.4375650729.

The spelling of 66153749 in words is "sixty-six million, one hundred fifty-three thousand, seven hundred forty-nine".