42665978893 has 2 divisors, whose sum is σ = 42665978894. Its totient is φ = 42665978892.

The previous prime is 42665978867. The next prime is 42665978899. The reversal of 42665978893 is 39887956624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38354480649 + 4311498244 = 195843^2 + 65662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42665978893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42665978899) 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 as a sum of consecutive naturals, namely, 21332989446 + 21332989447.

It is an arithmetic number, because the mean of its divisors is an integer number (21332989447).

Almost surely, 2^42665978893 is an apocalyptic number.

It is an amenable number.

42665978893 is a deficient number, since it is larger than the sum of its proper divisors (1).

42665978893 is an equidigital number, since it uses as much as digits as its factorization.

42665978893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 67.

The spelling of 42665978893 in words is "forty-two billion, six hundred sixty-five million, nine hundred seventy-eight thousand, eight hundred ninety-three".