66132749 has 4 divisors (see below), whose sum is σ = 69613440. Its totient is φ = 62652060.

The previous prime is 66132739. The next prime is 66132763. The reversal of 66132749 is 94723166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66132749 - 2¹² = 66128653 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 (66132719) 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, 1740317 + ... + 1740354.

It is an arithmetic number, because the mean of its divisors is an integer number (17403360).

Almost surely, 2^66132749 is an apocalyptic number.

It is an amenable number.

66132749 is a deficient number, since it is larger than the sum of its proper divisors (3480691).

66132749 is a wasteful number, since it uses less digits than its factorization.

66132749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480690.

The product of its digits is 54432, while the sum is 38.

The square root of 66132749 is about 8132.2044366826. The cubic root of 66132749 is about 404.3947653433.

The spelling of 66132749 in words is "sixty-six million, one hundred thirty-two thousand, seven hundred forty-nine".