204046977657581 has 2 divisors, whose sum is σ = 204046977657582. Its totient is φ = 204046977657580.

The previous prime is 204046977657491. The next prime is 204046977657683. The reversal of 204046977657581 is 185756779640402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143216867655625 + 60830110001956 = 11967325^2 + 7799366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204046977657581 is a prime.

It is a super-2 number, since 2×204046977657581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204046977657781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102023488828790 + 102023488828791.

It is an arithmetic number, because the mean of its divisors is an integer number (102023488828791).

Almost surely, 2^{204046977657581} is an apocalyptic number.

It is an amenable number.

204046977657581 is a deficient number, since it is larger than the sum of its proper divisors (1).

204046977657581 is an equidigital number, since it uses as much as digits as its factorization.

204046977657581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 711244800, while the sum is 71.

The spelling of 204046977657581 in words is "two hundred four trillion, forty-six billion, nine hundred seventy-seven million, six hundred fifty-seven thousand, five hundred eighty-one".