42409209253 has 2 divisors, whose sum is σ = 42409209254. Its totient is φ = 42409209252.

The previous prime is 42409209251. The next prime is 42409209277. The reversal of 42409209253 is 35290290424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38617359169 + 3791850084 = 196513^2 + 61578^2 .

It is a cyclic number.

It is not a de Polignac number, because 42409209253 - 2¹ = 42409209251 is a prime.

Together with 42409209251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42409209251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21204604626 + 21204604627.

It is an arithmetic number, because the mean of its divisors is an integer number (21204604627).

Almost surely, 2^42409209253 is an apocalyptic number.

It is an amenable number.

42409209253 is a deficient number, since it is larger than the sum of its proper divisors (1).

42409209253 is an equidigital number, since it uses as much as digits as its factorization.

42409209253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

Adding to 42409209253 its reverse (35290290424), we get a palindrome (77699499677).

The spelling of 42409209253 in words is "forty-two billion, four hundred nine million, two hundred nine thousand, two hundred fifty-three".