42778249646 has 16 divisors (see below), whose sum is σ = 71045562240. Its totient is φ = 19154439480.

The previous prime is 42778249643. The next prime is 42778249667. The reversal of 42778249646 is 64694287724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778249643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14509466 + ... + 14512413.

It is an arithmetic number, because the mean of its divisors is an integer number (4440347640).

Almost surely, 2^42778249646 is an apocalyptic number.

42778249646 is a deficient number, since it is larger than the sum of its proper divisors (28267312594).

42778249646 is a wasteful number, since it uses less digits than its factorization.

42778249646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29021959.

The product of its digits is 32514048, while the sum is 59.

The spelling of 42778249646 in words is "forty-two billion, seven hundred seventy-eight million, two hundred forty-nine thousand, six hundred forty-six".