65649757 has 4 divisors (see below), whose sum is σ = 65668636. Its totient is φ = 65630880.

The previous prime is 65649739. The next prime is 65649799. The reversal of 65649757 is 75794656.

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 1313316 + 64336441 = 1146^2 + 8021^2 .

It is a cyclic number.

It is not a de Polignac number, because 65649757 - 2⁷ = 65649629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65649757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65659757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2544 + ... + 11737.

It is an arithmetic number, because the mean of its divisors is an integer number (16417159).

Almost surely, 2^65649757 is an apocalyptic number.

It is an amenable number.

65649757 is a deficient number, since it is larger than the sum of its proper divisors (18879).

65649757 is a wasteful number, since it uses less digits than its factorization.

65649757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18878.

The product of its digits is 1587600, while the sum is 49.

The square root of 65649757 is about 8102.4537641384. The cubic root of 65649757 is about 403.4078772282.

The spelling of 65649757 in words is "sixty-five million, six hundred forty-nine thousand, seven hundred fifty-seven".