65070721099 has 2 divisors, whose sum is σ = 65070721100. Its totient is φ = 65070721098.

The previous prime is 65070721097. The next prime is 65070721117. The reversal of 65070721099 is 99012707056.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65070721099 - 2¹ = 65070721097 is a prime.

Together with 65070721097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65070721097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32535360549 + 32535360550.

It is an arithmetic number, because the mean of its divisors is an integer number (32535360550).

Almost surely, 2^65070721099 is an apocalyptic number.

65070721099 is a deficient number, since it is larger than the sum of its proper divisors (1).

65070721099 is an equidigital number, since it uses as much as digits as its factorization.

65070721099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 46.

The spelling of 65070721099 in words is "sixty-five billion, seventy million, seven hundred twenty-one thousand, ninety-nine".