42155783123 has 2 divisors, whose sum is σ = 42155783124. Its totient is φ = 42155783122.

The previous prime is 42155783063. The next prime is 42155783129. The reversal of 42155783123 is 32138755124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42155783123 - 2¹² = 42155779027 is a prime.

It is a super-2 number, since 2×42155783123² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42155783129) 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, 21077891561 + 21077891562.

It is an arithmetic number, because the mean of its divisors is an integer number (21077891562).

Almost surely, 2^42155783123 is an apocalyptic number.

42155783123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155783123 is an equidigital number, since it uses as much as digits as its factorization.

42155783123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The spelling of 42155783123 in words is "forty-two billion, one hundred fifty-five million, seven hundred eighty-three thousand, one hundred twenty-three".