158778522242 has 6 divisors (see below), whose sum is σ = 238168628649. Its totient is φ = 79388979360.

The previous prime is 158778522229. The next prime is 158778522247. The reversal of 158778522242 is 242225877851.

It can be written as a sum of positive squares in 2 ways, for example, as 151141335361 + 7637186881 = 388769^2 + 87391^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=281761.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158778522247) 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, 422642 + ... + 704402.

Almost surely, 2^158778522242 is an apocalyptic number.

158778522242 is a deficient number, since it is larger than the sum of its proper divisors (79390106407).

158778522242 is an frugal number, since it uses more digits than its factorization.

158778522242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563524 (or 281763 counting only the distinct ones).

The product of its digits is 5017600, while the sum is 53.

The spelling of 158778522242 in words is "one hundred fifty-eight billion, seven hundred seventy-eight million, five hundred twenty-two thousand, two hundred forty-two".