254681380721 has 2 divisors, whose sum is σ = 254681380722. Its totient is φ = 254681380720.

The previous prime is 254681380717. The next prime is 254681380853. The reversal of 254681380721 is 127083186452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247665475600 + 7015905121 = 497660^2 + 83761^2 .

It is a cyclic number.

It is not a de Polignac number, because 254681380721 - 2² = 254681380717 is a prime.

It is not a weakly prime, because it can be changed into another prime (254681383721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127340690360 + 127340690361.

It is an arithmetic number, because the mean of its divisors is an integer number (127340690361).

Almost surely, 2^254681380721 is an apocalyptic number.

It is an amenable number.

254681380721 is a deficient number, since it is larger than the sum of its proper divisors (1).

254681380721 is an equidigital number, since it uses as much as digits as its factorization.

254681380721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 254681380721 in words is "two hundred fifty-four billion, six hundred eighty-one million, three hundred eighty thousand, seven hundred twenty-one".