205979094154 has 8 divisors (see below), whose sum is σ = 308988630180. Its totient is φ = 102982884096.

The previous prime is 205979094143. The next prime is 205979094169. The reversal of 205979094154 is 451490979502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 196095751929 + 9883342225 = 442827^2 + 99415^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 205979094095 and 205979094104.

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, 3292759 + ... + 3354730.

Almost surely, 2^205979094154 is an apocalyptic number.

205979094154 is a deficient number, since it is larger than the sum of its proper divisors (103009536026).

205979094154 is a wasteful number, since it uses less digits than its factorization.

205979094154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662984.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 205979094154 in words is "two hundred five billion, nine hundred seventy-nine million, ninety-four thousand, one hundred fifty-four".