208131894607730 has 16 divisors (see below), whose sum is σ = 378846819399960. Its totient is φ = 82317333597312.

The previous prime is 208131894607717. The next prime is 208131894607733. The reversal of 208131894607730 is 37706498131802.

It is a happy number.

It is a Cunningham number, because it is equal to 14426777²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 164819661680521 + 43312232927209 = 12838211^2 + 6581203^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 208131894607730.

It is not an unprimeable number, because it can be changed into a prime (208131894607733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116928029789 + ... + 116928031568.

Almost surely, 2^{208131894607730} is an apocalyptic number.

208131894607730 is a deficient number, since it is larger than the sum of its proper divisors (170714924792230).

208131894607730 is a wasteful number, since it uses less digits than its factorization.

208131894607730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233856061453.

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 208131894607730 in words is "two hundred eight trillion, one hundred thirty-one billion, eight hundred ninety-four million, six hundred seven thousand, seven hundred thirty".