254436993649 has 2 divisors, whose sum is σ = 254436993650. Its totient is φ = 254436993648.

The previous prime is 254436993647. The next prime is 254436993683. The reversal of 254436993649 is 946399634452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254387079424 + 49914225 = 504368^2 + 7065^2 .

It is a cyclic number.

It is not a de Polignac number, because 254436993649 - 2¹ = 254436993647 is a prime.

Together with 254436993647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (254436993647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127218496824 + 127218496825.

It is an arithmetic number, because the mean of its divisors is an integer number (127218496825).

Almost surely, 2^254436993649 is an apocalyptic number.

It is an amenable number.

254436993649 is a deficient number, since it is larger than the sum of its proper divisors (1).

254436993649 is an equidigital number, since it uses as much as digits as its factorization.

254436993649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151165440, while the sum is 64.

The spelling of 254436993649 in words is "two hundred fifty-four billion, four hundred thirty-six million, nine hundred ninety-three thousand, six hundred forty-nine".