205211055066406 has 16 divisors (see below), whose sum is σ = 325976687493840. Its totient is φ = 96554131349760.

The previous prime is 205211055066371. The next prime is 205211055066439. The reversal of 205211055066406 is 604660550112502.

It is a super-2 number, since 2×205211055066406² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492817476 + ... + 493233703.

It is an arithmetic number, because the mean of its divisors is an integer number (20373542968365).

Almost surely, 2^{205211055066406} is an apocalyptic number.

205211055066406 is a deficient number, since it is larger than the sum of its proper divisors (120765632427434).

205211055066406 is a wasteful number, since it uses less digits than its factorization.

205211055066406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986057319.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 205211055066406 in words is "two hundred five trillion, two hundred eleven billion, fifty-five million, sixty-six thousand, four hundred six".