42778722561 has 8 divisors (see below), whose sum is σ = 57069974304. Its totient is φ = 28503309600.

The previous prime is 42778722551. The next prime is 42778722617. The reversal of 42778722561 is 16522787724.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42778722561 - 2⁵ = 42778722529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42778722541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3953391 + ... + 3964196.

It is an arithmetic number, because the mean of its divisors is an integer number (7133746788).

Almost surely, 2^42778722561 is an apocalyptic number.

It is an amenable number.

42778722561 is a deficient number, since it is larger than the sum of its proper divisors (14291251743).

42778722561 is a wasteful number, since it uses less digits than its factorization.

42778722561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7919391.

The product of its digits is 2634240, while the sum is 51.

The spelling of 42778722561 in words is "forty-two billion, seven hundred seventy-eight million, seven hundred twenty-two thousand, five hundred sixty-one".