30001640665 has 4 divisors (see below), whose sum is σ = 36001968804. Its totient is φ = 24001312528.

The previous prime is 30001640663. The next prime is 30001640671. The reversal of 30001640665 is 56604610003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56604610003 = 38459 ⋅1471817.

It can be written as a sum of positive squares in 2 ways, for example, as 12139852761 + 17861787904 = 110181^2 + 133648^2 .

It is a cyclic number.

It is not a de Polignac number, because 30001640665 - 2¹ = 30001640663 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30001640663) 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, 3000164062 + ... + 3000164071.

It is an arithmetic number, because the mean of its divisors is an integer number (9000492201).

Almost surely, 2^30001640665 is an apocalyptic number.

It is an amenable number.

30001640665 is a deficient number, since it is larger than the sum of its proper divisors (6000328139).

30001640665 is an equidigital number, since it uses as much as digits as its factorization.

30001640665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000328138.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 30001640665 in words is "thirty billion, one million, six hundred forty thousand, six hundred sixty-five".