42787538693 has 2 divisors, whose sum is σ = 42787538694. Its totient is φ = 42787538692.

The previous prime is 42787538683. The next prime is 42787538711. The reversal of 42787538693 is 39683578724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36999676609 + 5787862084 = 192353^2 + 76078^2 .

It is a cyclic number.

It is not a de Polignac number, because 42787538693 - 2³⁴ = 25607669509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42787538603) 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 as a sum of consecutive naturals, namely, 21393769346 + 21393769347.

It is an arithmetic number, because the mean of its divisors is an integer number (21393769347).

Almost surely, 2^42787538693 is an apocalyptic number.

It is an amenable number.

42787538693 is a deficient number, since it is larger than the sum of its proper divisors (1).

42787538693 is an equidigital number, since it uses as much as digits as its factorization.

42787538693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 62.

The spelling of 42787538693 in words is "forty-two billion, seven hundred eighty-seven million, five hundred thirty-eight thousand, six hundred ninety-three".