206621896090 has 32 divisors (see below), whose sum is σ = 382905484560. Its totient is φ = 80218335744.

The previous prime is 206621896051. The next prime is 206621896157. The reversal of 206621896090 is 90698126602.

It can be written as a sum of positive squares in 8 ways, for example, as 204653997769 + 1967898321 = 452387^2 + 44361^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531357 + ... + 834016.

Almost surely, 2^206621896090 is an apocalyptic number.

206621896090 is a deficient number, since it is larger than the sum of its proper divisors (176283588470).

206621896090 is a wasteful number, since it uses less digits than its factorization.

206621896090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365826.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 206621896090 in words is "two hundred six billion, six hundred twenty-one million, eight hundred ninety-six thousand, ninety".