65340721099 has 16 divisors (see below), whose sum is σ = 69473364480. Its totient is φ = 61277895360.

The previous prime is 65340721013. The next prime is 65340721141. The reversal of 65340721099 is 99012704356.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 65340721099 - 2¹⁷ = 65340590027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65340721009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7649559 + ... + 7658095.

It is an arithmetic number, because the mean of its divisors is an integer number (4342085280).

Almost surely, 2^65340721099 is an apocalyptic number.

65340721099 is a deficient number, since it is larger than the sum of its proper divisors (4132643381).

65340721099 is a wasteful number, since it uses less digits than its factorization.

65340721099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12570.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 65340721099 in words is "sixty-five billion, three hundred forty million, seven hundred twenty-one thousand, ninety-nine".