306144430665421 has 2 divisors, whose sum is σ = 306144430665422. Its totient is φ = 306144430665420.

The previous prime is 306144430665401. The next prime is 306144430665431. The reversal of 306144430665421 is 124566034441603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288641411302500 + 17503019362921 = 16989450^2 + 4183661^2 .

It is a cyclic number.

It is not a de Polignac number, because 306144430665421 - 2⁹ = 306144430664909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306144430665401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153072215332710 + 153072215332711.

It is an arithmetic number, because the mean of its divisors is an integer number (153072215332711).

Almost surely, 2^{306144430665421} is an apocalyptic number.

It is an amenable number.

306144430665421 is a deficient number, since it is larger than the sum of its proper divisors (1).

306144430665421 is an equidigital number, since it uses as much as digits as its factorization.

306144430665421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 49.

The spelling of 306144430665421 in words is "three hundred six trillion, one hundred forty-four billion, four hundred thirty million, six hundred sixty-five thousand, four hundred twenty-one".