42345505381 has 2 divisors, whose sum is σ = 42345505382. Its totient is φ = 42345505380.

The previous prime is 42345505373. The next prime is 42345505417. The reversal of 42345505381 is 18350554324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39049712100 + 3295793281 = 197610^2 + 57409^2 .

It is a cyclic number.

It is not a de Polignac number, because 42345505381 - 2³ = 42345505373 is a prime.

It is a super-2 number, since 2×42345505381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42345505481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21172752690 + 21172752691.

It is an arithmetic number, because the mean of its divisors is an integer number (21172752691).

Almost surely, 2^42345505381 is an apocalyptic number.

It is an amenable number.

42345505381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42345505381 is an equidigital number, since it uses as much as digits as its factorization.

42345505381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 42345505381 in words is "forty-two billion, three hundred forty-five million, five hundred five thousand, three hundred eighty-one".