42205002578 has 6 divisors (see below), whose sum is σ = 63307939671. Its totient is φ = 21102356022.

The previous prime is 42205002571. The next prime is 42205002589. The reversal of 42205002578 is 87520050224.

It can be written as a sum of positive squares in only one way, i.e., 21102501289 + 21102501289 = 145267^2 + 145267^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=145267.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42205002571) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217901 + ... + 363167.

Almost surely, 2^42205002578 is an apocalyptic number.

42205002578 is a deficient number, since it is larger than the sum of its proper divisors (21102937093).

42205002578 is an frugal number, since it uses more digits than its factorization.

42205002578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290536 (or 145269 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The spelling of 42205002578 in words is "forty-two billion, two hundred five million, two thousand, five hundred seventy-eight".