42043471649 has 2 divisors, whose sum is σ = 42043471650. Its totient is φ = 42043471648.

The previous prime is 42043471627. The next prime is 42043471669. The reversal of 42043471649 is 94617434024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31397359249 + 10646112400 = 177193^2 + 103180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42043471649 is a prime.

It is not a weakly prime, because it can be changed into another prime (42043471609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021735824 + 21021735825.

It is an arithmetic number, because the mean of its divisors is an integer number (21021735825).

Almost surely, 2^42043471649 is an apocalyptic number.

It is an amenable number.

42043471649 is a deficient number, since it is larger than the sum of its proper divisors (1).

42043471649 is an equidigital number, since it uses as much as digits as its factorization.

42043471649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 42043471649 in words is "forty-two billion, forty-three million, four hundred seventy-one thousand, six hundred forty-nine".