42154405123 has 2 divisors, whose sum is σ = 42154405124. Its totient is φ = 42154405122.

The previous prime is 42154405099. The next prime is 42154405159. The reversal of 42154405123 is 32150445124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42154405123 - 2⁵ = 42154405091 is a prime.

It is not a weakly prime, because it can be changed into another prime (42154405193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077202561 + 21077202562.

It is an arithmetic number, because the mean of its divisors is an integer number (21077202562).

Almost surely, 2^42154405123 is an apocalyptic number.

42154405123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42154405123 is an equidigital number, since it uses as much as digits as its factorization.

42154405123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 42154405123 in words is "forty-two billion, one hundred fifty-four million, four hundred five thousand, one hundred twenty-three".