205701623261 has 2 divisors, whose sum is σ = 205701623262. Its totient is φ = 205701623260.

The previous prime is 205701623219. The next prime is 205701623339. The reversal of 205701623261 is 162326107502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204208187236 + 1493436025 = 451894^2 + 38645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205701623261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205701613261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102850811630 + 102850811631.

It is an arithmetic number, because the mean of its divisors is an integer number (102850811631).

Almost surely, 2^205701623261 is an apocalyptic number.

It is an amenable number.

205701623261 is a deficient number, since it is larger than the sum of its proper divisors (1).

205701623261 is an equidigital number, since it uses as much as digits as its factorization.

205701623261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 205701623261 in words is "two hundred five billion, seven hundred one million, six hundred twenty-three thousand, two hundred sixty-one".