66049757 has 4 divisors (see below), whose sum is σ = 69526080. Its totient is φ = 62573436.

The previous prime is 66049741. The next prime is 66049759. The reversal of 66049757 is 75794066.

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 66049757 - 2⁴ = 66049741 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 (66049759) 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, 1738133 + ... + 1738170.

It is an arithmetic number, because the mean of its divisors is an integer number (17381520).

Almost surely, 2^66049757 is an apocalyptic number.

It is an amenable number.

66049757 is a deficient number, since it is larger than the sum of its proper divisors (3476323).

66049757 is a wasteful number, since it uses less digits than its factorization.

66049757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476322.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 66049757 is about 8127.1001593434. The cubic root of 66049757 is about 404.2255320975.

It can be divided in two parts, 6604 and 9757, that added together give a palindrome (16361).

The spelling of 66049757 in words is "sixty-six million, forty-nine thousand, seven hundred fifty-seven".