42421717649 has 4 divisors (see below), whose sum is σ = 42422218020. Its totient is φ = 42421217280.

The previous prime is 42421717643. The next prime is 42421717673. The reversal of 42421717649 is 94671712424.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26266036624 + 16155681025 = 162068^2 + 127105^2 .

It is a cyclic number.

It is not a de Polignac number, because 42421717649 - 2¹² = 42421713553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42421717643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87944 + ... + 304265.

It is an arithmetic number, because the mean of its divisors is an integer number (10605554505).

Almost surely, 2^42421717649 is an apocalyptic number.

It is an amenable number.

42421717649 is a deficient number, since it is larger than the sum of its proper divisors (500371).

42421717649 is a wasteful number, since it uses less digits than its factorization.

42421717649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500370.

The product of its digits is 677376, while the sum is 47.

The spelling of 42421717649 in words is "forty-two billion, four hundred twenty-one million, seven hundred seventeen thousand, six hundred forty-nine".