42155244449 has 2 divisors, whose sum is σ = 42155244450. Its totient is φ = 42155244448.

The previous prime is 42155244421. The next prime is 42155244457. The reversal of 42155244449 is 94444255124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32532615424 + 9622629025 = 180368^2 + 98095^2 .

It is a cyclic number.

It is not a de Polignac number, because 42155244449 - 2²⁰ = 42154195873 is a prime.

It is not a weakly prime, because it can be changed into another prime (42155244949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077622224 + 21077622225.

It is an arithmetic number, because the mean of its divisors is an integer number (21077622225).

Almost surely, 2^42155244449 is an apocalyptic number.

It is an amenable number.

42155244449 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155244449 is an equidigital number, since it uses as much as digits as its factorization.

42155244449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921600, while the sum is 44.

The spelling of 42155244449 in words is "forty-two billion, one hundred fifty-five million, two hundred forty-four thousand, four hundred forty-nine".