208020741556 has 24 divisors (see below), whose sum is σ = 371207166120. Its totient is φ = 101964749952.

The previous prime is 208020741547. The next prime is 208020741563. The reversal of 208020741556 is 655147020802.

It can be written as a sum of positive squares in 4 ways, for example, as 138912744100 + 69107997456 = 372710^2 + 262884^2 .

It is a super-2 number, since 2×208020741556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138651 + ... + 659746.

It is an arithmetic number, because the mean of its divisors is an integer number (15466965255).

Almost surely, 2^208020741556 is an apocalyptic number.

It is an amenable number.

208020741556 is a deficient number, since it is larger than the sum of its proper divisors (163186424564).

208020741556 is a wasteful number, since it uses less digits than its factorization.

208020741556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799683 (or 799681 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 208020741556 in words is "two hundred eight billion, twenty million, seven hundred forty-one thousand, five hundred fifty-six".