4001564639 has 2 divisors, whose sum is σ = 4001564640. Its totient is φ = 4001564638.

The previous prime is 4001564629. The next prime is 4001564647. The reversal of 4001564639 is 9364651004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001564639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001564629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000782319 + 2000782320.

It is an arithmetic number, because the mean of its divisors is an integer number (2000782320).

Almost surely, 2^4001564639 is an apocalyptic number.

4001564639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001564639 is an equidigital number, since it uses as much as digits as its factorization.

4001564639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 4001564639 is about 63257.9215513757. The cubic root of 4001564639 is about 1587.6080007867.

The spelling of 4001564639 in words is "four billion, one million, five hundred sixty-four thousand, six hundred thirty-nine".