42340220257 has 2 divisors, whose sum is σ = 42340220258. Its totient is φ = 42340220256.

The previous prime is 42340220233. The next prime is 42340220317. The reversal of 42340220257 is 75202204324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38315713536 + 4024506721 = 195744^2 + 63439^2 .

It is a cyclic number.

It is not a de Polignac number, because 42340220257 - 2⁷ = 42340220129 is a prime.

It is a super-2 number, since 2×42340220257² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42340220557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21170110128 + 21170110129.

It is an arithmetic number, because the mean of its divisors is an integer number (21170110129).

Almost surely, 2^42340220257 is an apocalyptic number.

It is an amenable number.

42340220257 is a deficient number, since it is larger than the sum of its proper divisors (1).

42340220257 is an equidigital number, since it uses as much as digits as its factorization.

42340220257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 31.

The spelling of 42340220257 in words is "forty-two billion, three hundred forty million, two hundred twenty thousand, two hundred fifty-seven".