42447036829 has 2 divisors, whose sum is σ = 42447036830. Its totient is φ = 42447036828.

The previous prime is 42447036817. The next prime is 42447036949. The reversal of 42447036829 is 92863074424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25865323929 + 16581712900 = 160827^2 + 128770^2 .

It is a cyclic number.

It is not a de Polignac number, because 42447036829 - 2⁷ = 42447036701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42447036809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21223518414 + 21223518415.

It is an arithmetic number, because the mean of its divisors is an integer number (21223518415).

Almost surely, 2^42447036829 is an apocalyptic number.

It is an amenable number.

42447036829 is a deficient number, since it is larger than the sum of its proper divisors (1).

42447036829 is an equidigital number, since it uses as much as digits as its factorization.

42447036829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 42447036829 in words is "forty-two billion, four hundred forty-seven million, thirty-six thousand, eight hundred twenty-nine".