208621070864 has 20 divisors (see below), whose sum is σ = 408744937980. Its totient is φ = 103138506240.

The previous prime is 208621070837. The next prime is 208621070887. The reversal of 208621070864 is 468070126802.

It can be written as a sum of positive squares in 2 ways, for example, as 102144160000 + 106476910864 = 319600^2 + 326308^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73250357 + ... + 73253204.

It is an arithmetic number, because the mean of its divisors is an integer number (20437246899).

Almost surely, 2^208621070864 is an apocalyptic number.

It is an amenable number.

208621070864 is a deficient number, since it is larger than the sum of its proper divisors (200123867116).

208621070864 is a wasteful number, since it uses less digits than its factorization.

208621070864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146503658 (or 146503652 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 208621070864 in words is "two hundred eight billion, six hundred twenty-one million, seventy thousand, eight hundred sixty-four".