65709099649 has 4 divisors (see below), whose sum is σ = 66948894036. Its totient is φ = 64469305264.

The previous prime is 65709099637. The next prime is 65709099683. The reversal of 65709099649 is 94699090756.

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 16655709249 + 49053390400 = 129057^2 + 221480^2 .

It is a cyclic number.

It is not a de Polignac number, because 65709099649 - 2¹⁵ = 65709066881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65709099619) 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, 619897114 + ... + 619897219.

It is an arithmetic number, because the mean of its divisors is an integer number (16737223509).

Almost surely, 2^65709099649 is an apocalyptic number.

It is an amenable number.

65709099649 is a deficient number, since it is larger than the sum of its proper divisors (1239794387).

65709099649 is a wasteful number, since it uses less digits than its factorization.

65709099649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239794386.

The product of its (nonzero) digits is 33067440, while the sum is 64.

The spelling of 65709099649 in words is "sixty-five billion, seven hundred nine million, ninety-nine thousand, six hundred forty-nine".