208236849664 has 20 divisors (see below), whose sum is σ = 416066987754. Its totient is φ = 104118424576.

The previous prime is 208236849647. The next prime is 208236849671. The reversal of 208236849664 is 466948632802.

It can be written as a sum of positive squares in only one way, i.e., 205216248064 + 3020601600 = 453008^2 + 54960^2 .

It is a junction number, because it is equal to n+sod(n) for n = 208236849599 and 208236849608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203355787 + ... + 203356810.

Almost surely, 2^208236849664 is an apocalyptic number.

It is an amenable number.

208236849664 is a deficient number, since it is larger than the sum of its proper divisors (207830138090).

208236849664 is an frugal number, since it uses more digits than its factorization.

208236849664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406712615 (or 406712599 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 58.

The spelling of 208236849664 in words is "two hundred eight billion, two hundred thirty-six million, eight hundred forty-nine thousand, six hundred sixty-four".