42534390923 has 2 divisors, whose sum is σ = 42534390924. Its totient is φ = 42534390922.

The previous prime is 42534390919. The next prime is 42534390953. The reversal of 42534390923 is 32909343524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42534390923 - 2² = 42534390919 is a prime.

It is a super-2 number, since 2×42534390923² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42534390953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21267195461 + 21267195462.

It is an arithmetic number, because the mean of its divisors is an integer number (21267195462).

Almost surely, 2^42534390923 is an apocalyptic number.

42534390923 is a deficient number, since it is larger than the sum of its proper divisors (1).

42534390923 is an equidigital number, since it uses as much as digits as its factorization.

42534390923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 44.

The spelling of 42534390923 in words is "forty-two billion, five hundred thirty-four million, three hundred ninety thousand, nine hundred twenty-three".