1642443939229 has 2 divisors, whose sum is σ = 1642443939230. Its totient is φ = 1642443939228.

The previous prime is 1642443939217. The next prime is 1642443939299. The reversal of 1642443939229 is 9229393442461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1641281265625 + 1162673604 = 1281125^2 + 34098^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642443939229 - 2²⁷ = 1642309721501 is a prime.

It is a super-2 number, since 2×1642443939229² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642443939299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821221969614 + 821221969615.

It is an arithmetic number, because the mean of its divisors is an integer number (821221969615).

Almost surely, 2^{1642443939229} is an apocalyptic number.

It is an amenable number.

1642443939229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642443939229 is an equidigital number, since it uses as much as digits as its factorization.

1642443939229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 58.

The spelling of 1642443939229 in words is "one trillion, six hundred forty-two billion, four hundred forty-three million, nine hundred thirty-nine thousand, two hundred twenty-nine".