42780267617 has 4 divisors (see below), whose sum is σ = 43052753556. Its totient is φ = 42507781680.

The previous prime is 42780267587. The next prime is 42780267671. The reversal of 42780267617 is 71676208724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32385241681 + 10395025936 = 179959^2 + 101956^2 .

It is a cyclic number.

It is not a de Polignac number, because 42780267617 - 2¹⁶ = 42780202081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42780267017) 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 3 ways as a sum of consecutive naturals, for example, 136242734 + ... + 136243047.

It is an arithmetic number, because the mean of its divisors is an integer number (10763188389).

Almost surely, 2^42780267617 is an apocalyptic number.

It is an amenable number.

42780267617 is a deficient number, since it is larger than the sum of its proper divisors (272485939).

42780267617 is a wasteful number, since it uses less digits than its factorization.

42780267617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272485938.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 42780267617 in words is "forty-two billion, seven hundred eighty million, two hundred sixty-seven thousand, six hundred seventeen".