205312470661 has 2 divisors, whose sum is σ = 205312470662. Its totient is φ = 205312470660.

The previous prime is 205312470599. The next prime is 205312470679. The reversal of 205312470661 is 166074213502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199635601636 + 5676869025 = 446806^2 + 75345^2 .

It is a cyclic number.

It is not a de Polignac number, because 205312470661 - 2²¹ = 205310373509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205312470661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205312470691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102656235330 + 102656235331.

It is an arithmetic number, because the mean of its divisors is an integer number (102656235331).

Almost surely, 2^205312470661 is an apocalyptic number.

It is an amenable number.

205312470661 is a deficient number, since it is larger than the sum of its proper divisors (1).

205312470661 is an equidigital number, since it uses as much as digits as its factorization.

205312470661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 205312470661 in words is "two hundred five billion, three hundred twelve million, four hundred seventy thousand, six hundred sixty-one".