208613254564 has 81 divisors (see below), whose sum is σ = 434793088611. Its totient is φ = 87475227840.

The previous prime is 208613254561. The next prime is 208613254609. The reversal of 208613254564 is 465452316802.

It is a happy number.

The square root of 208613254564 is 456742.

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

It can be written as a sum of positive squares in 4 ways, for example, as 89007948964 + 119605305600 = 298342^2 + 345840^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208613254561) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 130627414 + ... + 130629010.

Almost surely, 2^208613254564 is an apocalyptic number.

208613254564 is the 456742-nd square number.

It is an amenable number.

208613254564 is an abundant number, since it is smaller than the sum of its proper divisors (226179834047).

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

208613254564 is a wasteful number, since it uses less digits than its factorization.

208613254564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246 (or 1623 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 46.

The spelling of 208613254564 in words is "two hundred eight billion, six hundred thirteen million, two hundred fifty-four thousand, five hundred sixty-four".