205084343978 has 4 divisors (see below), whose sum is σ = 307626515970. Its totient is φ = 102542171988.

The previous prime is 205084343951. The next prime is 205084343983. The reversal of 205084343978 is 879343480502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 108085110169 + 96999233809 = 328763^2 + 311447^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51271085993 + ... + 51271085996.

Almost surely, 2^205084343978 is an apocalyptic number.

205084343978 is a deficient number, since it is larger than the sum of its proper divisors (102542171992).

205084343978 is a wasteful number, since it uses less digits than its factorization.

205084343978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102542171991.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 205084343978 in words is "two hundred five billion, eighty-four million, three hundred forty-three thousand, nine hundred seventy-eight".