5639661000 has 96 divisors (see below), whose sum is σ = 19062084600. Its totient is φ = 1503907200.

The previous prime is 5639660993. The next prime is 5639661029. The reversal of 5639661000 is 1669365.

5639661000 is a `hidden beast` number, since 5 + 6 + 39 + 6 + 610 + 0 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3104941284 + 2534719716 = 55722^2 + 50346^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304315 + ... + 322314.

Almost surely, 2^5639661000 is an apocalyptic number.

5639661000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

5639661000 is an abundant number, since it is smaller than the sum of its proper divisors (13422423600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5639661000 is a wasteful number, since it uses less digits than its factorization.

5639661000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626656 (or 626639 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 5639661000 is about 75097.6763954784. The cubic root of 5639661000 is about 1779.9904262415.

The spelling of 5639661000 in words is "five billion, six hundred thirty-nine million, six hundred sixty-one thousand".