65699949 has 16 divisors (see below), whose sum is σ = 100782080. Its totient is φ = 37292400.

The previous prime is 65699899. The next prime is 65699957. The reversal of 65699949 is 94999656.

65699949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65699949 - 2⁸ = 65699693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65699969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7189 + ... + 13530.

It is an arithmetic number, because the mean of its divisors is an integer number (6298880).

Almost surely, 2^65699949 is an apocalyptic number.

It is an amenable number.

65699949 is a deficient number, since it is larger than the sum of its proper divisors (35082131).

65699949 is a wasteful number, since it uses less digits than its factorization.

65699949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20880.

The product of its digits is 4723920, while the sum is 57.

The square root of 65699949 is about 8105.5505056720. The cubic root of 65699949 is about 403.5106584680.

The spelling of 65699949 in words is "sixty-five million, six hundred ninety-nine thousand, nine hundred forty-nine".