30721706065 has 16 divisors (see below), whose sum is σ = 37206667008. Its totient is φ = 24350454016.

The previous prime is 30721706063. The next prime is 30721706117. The reversal of 30721706065 is 56060712703.

It is a cyclic number.

It is not a de Polignac number, because 30721706065 - 2¹ = 30721706063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30721706063) 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, 1699002 + ... + 1716988.

It is an arithmetic number, because the mean of its divisors is an integer number (2325416688).

Almost surely, 2^30721706065 is an apocalyptic number.

It is an amenable number.

30721706065 is a deficient number, since it is larger than the sum of its proper divisors (6484960943).

30721706065 is a wasteful number, since it uses less digits than its factorization.

30721706065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21128.

The product of its (nonzero) digits is 52920, while the sum is 37.

The spelling of 30721706065 in words is "thirty billion, seven hundred twenty-one million, seven hundred six thousand, sixty-five".