42819851369 has 2 divisors, whose sum is σ = 42819851370. Its totient is φ = 42819851368.

The previous prime is 42819851351. The next prime is 42819851401. The reversal of 42819851369 is 96315891824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42266425744 + 553425625 = 205588^2 + 23525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42819851369 is a prime.

It is a super-2 number, since 2×42819851369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42819851329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409925684 + 21409925685.

It is an arithmetic number, because the mean of its divisors is an integer number (21409925685).

Almost surely, 2^42819851369 is an apocalyptic number.

It is an amenable number.

42819851369 is a deficient number, since it is larger than the sum of its proper divisors (1).

42819851369 is an equidigital number, since it uses as much as digits as its factorization.

42819851369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 56.

The spelling of 42819851369 in words is "forty-two billion, eight hundred nineteen million, eight hundred fifty-one thousand, three hundred sixty-nine".