66267749 has 4 divisors (see below), whose sum is σ = 66875820. Its totient is φ = 65659680.

The previous prime is 66267743. The next prime is 66267787. The reversal of 66267749 is 94776266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18062500 + 48205249 = 4250^2 + 6943^2 .

It is a cyclic number.

It is not a de Polignac number, because 66267749 - 2⁸ = 66267493 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 (66267743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303872 + ... + 304089.

It is an arithmetic number, because the mean of its divisors is an integer number (16718955).

Almost surely, 2^66267749 is an apocalyptic number.

It is an amenable number.

66267749 is a deficient number, since it is larger than the sum of its proper divisors (608071).

66267749 is a wasteful number, since it uses less digits than its factorization.

66267749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608070.

The product of its digits is 762048, while the sum is 47.

The square root of 66267749 is about 8140.5005374363. The cubic root of 66267749 is about 404.6697485562.

The spelling of 66267749 in words is "sixty-six million, two hundred sixty-seven thousand, seven hundred forty-nine".