4001615641609 has 2 divisors, whose sum is σ = 4001615641610. Its totient is φ = 4001615641608.

The previous prime is 4001615641483. The next prime is 4001615641637. The reversal of 4001615641609 is 9061465161004.

4001615641609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3512494447225 + 489121194384 = 1874165^2 + 699372^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001615641609 - 2⁷ = 4001615641481 is a prime.

It is not a weakly prime, because it can be changed into another prime (4001615641679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000807820804 + 2000807820805.

It is an arithmetic number, because the mean of its divisors is an integer number (2000807820805).

Almost surely, 2^{4001615641609} is an apocalyptic number.

It is an amenable number.

4001615641609 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001615641609 is an equidigital number, since it uses as much as digits as its factorization.

4001615641609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 4001615641609 in words is "four trillion, one billion, six hundred fifteen million, six hundred forty-one thousand, six hundred nine".