4001644513 has 2 divisors, whose sum is σ = 4001644514. Its totient is φ = 4001644512.

The previous prime is 4001644487. The next prime is 4001644523. The reversal of 4001644513 is 3154461004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3854919744 + 146724769 = 62088^2 + 12113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001644513 is a prime.

It is not a weakly prime, because it can be changed into another prime (4001644523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000822256 + 2000822257.

It is an arithmetic number, because the mean of its divisors is an integer number (2000822257).

Almost surely, 2^4001644513 is an apocalyptic number.

It is an amenable number.

4001644513 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001644513 is an equidigital number, since it uses as much as digits as its factorization.

4001644513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 4001644513 is about 63258.5528841753. The cubic root of 4001644513 is about 1587.6185639680.

The spelling of 4001644513 in words is "four billion, one million, six hundred forty-four thousand, five hundred thirteen".