205611317078 has 8 divisors (see below), whose sum is σ = 314979039072. Its totient is φ = 100618304056.

The previous prime is 205611317057. The next prime is 205611317081. The reversal of 205611317078 is 870713116502.

It is a happy number.

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

It is a congruent number.

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, 1093677125 + ... + 1093677312.

It is an arithmetic number, because the mean of its divisors is an integer number (39372379884).

Almost surely, 2^205611317078 is an apocalyptic number.

205611317078 is a deficient number, since it is larger than the sum of its proper divisors (109367721994).

205611317078 is a wasteful number, since it uses less digits than its factorization.

205611317078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187354486.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 205611317078 in words is "two hundred five billion, six hundred eleven million, three hundred seventeen thousand, seventy-eight".