208937690242 has 16 divisors (see below), whose sum is σ = 313867145592. Its totient is φ = 104315357440.

The previous prime is 208937690209. The next prime is 208937690251. The reversal of 208937690242 is 242096739802.

It can be written as a sum of positive squares in 4 ways, for example, as 68283438721 + 140654251521 = 261311^2 + 375039^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 208937690242.

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 7 ways as a sum of consecutive naturals, for example, 14582442 + ... + 14596762.

Almost surely, 2^208937690242 is an apocalyptic number.

208937690242 is a deficient number, since it is larger than the sum of its proper divisors (104929455350).

208937690242 is a wasteful number, since it uses less digits than its factorization.

208937690242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24533.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 208937690242 in words is "two hundred eight billion, nine hundred thirty-seven million, six hundred ninety thousand, two hundred forty-two".