3999550564 has 27 divisors (see below), whose sum is σ = 7090923987. Its totient is φ = 1973909304.

The previous prime is 3999550561. The next prime is 3999550567. The reversal of 3999550564 is 4650559993.

It is a happy number.

The square root of 3999550564 is 63242.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (3999550561) and next prime (3999550567).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3999550561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13027699 + ... + 13028005.

Almost surely, 2^3999550564 is an apocalyptic number.

3999550564 is the 63242-nd square number.

It is an amenable number.

3999550564 is a deficient number, since it is larger than the sum of its proper divisors (3091373423).

3999550564 is an equidigital number, since it uses as much as digits as its factorization.

3999550564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 6561000, while the sum is 55.

The cubic root of 3999550564 is about 1587.3415968098.

The spelling of 3999550564 in words is "three billion, nine hundred ninety-nine million, five hundred fifty thousand, five hundred sixty-four".