42686371789 has 2 divisors, whose sum is σ = 42686371790. Its totient is φ = 42686371788.

The previous prime is 42686371757. The next prime is 42686371801. The reversal of 42686371789 is 98717368624.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42514316100 + 172055689 = 206190^2 + 13117^2 .

It is a cyclic number.

It is not a de Polignac number, because 42686371789 - 2⁵ = 42686371757 is a prime.

It is a super-3 number, since 3×42686371789³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42686371729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21343185894 + 21343185895.

It is an arithmetic number, because the mean of its divisors is an integer number (21343185895).

Almost surely, 2^42686371789 is an apocalyptic number.

It is an amenable number.

42686371789 is a deficient number, since it is larger than the sum of its proper divisors (1).

42686371789 is an equidigital number, since it uses as much as digits as its factorization.

42686371789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 61.

The spelling of 42686371789 in words is "forty-two billion, six hundred eighty-six million, three hundred seventy-one thousand, seven hundred eighty-nine".