205616967091 has 8 divisors (see below), whose sum is σ = 208664067168. Its totient is φ = 202574064000.

The previous prime is 205616967079. The next prime is 205616967107. The reversal of 205616967091 is 190769616502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205616967091 - 2³¹ = 203469483443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205616967991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950470 + ... + 1146571.

It is an arithmetic number, because the mean of its divisors is an integer number (26083008396).

Almost surely, 2^205616967091 is an apocalyptic number.

205616967091 is a deficient number, since it is larger than the sum of its proper divisors (3047100077).

205616967091 is a wasteful number, since it uses less digits than its factorization.

205616967091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098493.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 205616967091 in words is "two hundred five billion, six hundred sixteen million, nine hundred sixty-seven thousand, ninety-one".