253816805549 has 2 divisors, whose sum is σ = 253816805550. Its totient is φ = 253816805548.

The previous prime is 253816805477. The next prime is 253816805569. The reversal of 253816805549 is 945508618352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206361232900 + 47455572649 = 454270^2 + 217843^2 .

It is a cyclic number.

It is not a de Polignac number, because 253816805549 - 2²⁴ = 253800028333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253816805494 and 253816805503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253816805569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126908402774 + 126908402775.

It is an arithmetic number, because the mean of its divisors is an integer number (126908402775).

Almost surely, 2^253816805549 is an apocalyptic number.

It is an amenable number.

253816805549 is a deficient number, since it is larger than the sum of its proper divisors (1).

253816805549 is an equidigital number, since it uses as much as digits as its factorization.

253816805549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368000, while the sum is 56.

The spelling of 253816805549 in words is "two hundred fifty-three billion, eight hundred sixteen million, eight hundred five thousand, five hundred forty-nine".