642323370230309 has 2 divisors, whose sum is σ = 642323370230310. Its totient is φ = 642323370230308.

The previous prime is 642323370230177. The next prime is 642323370230419. The reversal of 642323370230309 is 903032073323246.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578109271473409 + 64214098756900 = 24043903^2 + 8013370^2 .

It is a cyclic number.

It is not a de Polignac number, because 642323370230309 - 2²⁸ = 642323101794853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642323370230809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321161685115154 + 321161685115155.

It is an arithmetic number, because the mean of its divisors is an integer number (321161685115155).

Almost surely, 2^{642323370230309} is an apocalyptic number.

It is an amenable number.

642323370230309 is a deficient number, since it is larger than the sum of its proper divisors (1).

642323370230309 is an equidigital number, since it uses as much as digits as its factorization.

642323370230309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 47.

The spelling of 642323370230309 in words is "six hundred forty-two trillion, three hundred twenty-three billion, three hundred seventy million, two hundred thirty thousand, three hundred nine".