42123167689 has 2 divisors, whose sum is σ = 42123167690. Its totient is φ = 42123167688.

The previous prime is 42123167657. The next prime is 42123167701. The reversal of 42123167689 is 98676132124.

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., 41507135289 + 616032400 = 203733^2 + 24820^2 .

It is a cyclic number.

It is not a de Polignac number, because 42123167689 - 2⁵ = 42123167657 is a prime.

It is a super-2 number, since 2×42123167689² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42123197689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061583844 + 21061583845.

It is an arithmetic number, because the mean of its divisors is an integer number (21061583845).

Almost surely, 2^42123167689 is an apocalyptic number.

It is an amenable number.

42123167689 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123167689 is an equidigital number, since it uses as much as digits as its factorization.

42123167689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The spelling of 42123167689 in words is "forty-two billion, one hundred twenty-three million, one hundred sixty-seven thousand, six hundred eighty-nine".