42837791978 has 8 divisors (see below), whose sum is σ = 65469078468. Its totient is φ = 21014765824.

The previous prime is 42837791977. The next prime is 42837792013. The reversal of 42837791978 is 87919773824.

It can be written as a sum of positive squares in 2 ways, for example, as 42175604689 + 662187289 = 205367^2 + 25733^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42837791977) 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, 202064951 + ... + 202065162.

Almost surely, 2^42837791978 is an apocalyptic number.

42837791978 is a deficient number, since it is larger than the sum of its proper divisors (22631286490).

42837791978 is a wasteful number, since it uses less digits than its factorization.

42837791978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404130168.

The product of its digits is 42674688, while the sum is 65.

The spelling of 42837791978 in words is "forty-two billion, eight hundred thirty-seven million, seven hundred ninety-one thousand, nine hundred seventy-eight".