42666000781 has 2 divisors, whose sum is σ = 42666000782. Its totient is φ = 42666000780.

The previous prime is 42666000737. The next prime is 42666000821. The reversal of 42666000781 is 18700066624.

It is an a-pointer prime, because the next prime (42666000821) can be obtained adding 42666000781 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40585728681 + 2080272100 = 201459^2 + 45610^2 .

It is a cyclic number.

It is not a de Polignac number, because 42666000781 - 2³¹ = 40518517133 is a prime.

It is a super-2 number, since 2×42666000781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42666000721) 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, 21333000390 + 21333000391.

It is an arithmetic number, because the mean of its divisors is an integer number (21333000391).

Almost surely, 2^42666000781 is an apocalyptic number.

It is an amenable number.

42666000781 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666000781 is an equidigital number, since it uses as much as digits as its factorization.

42666000781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 42666000781 in words is "forty-two billion, six hundred sixty-six million, seven hundred eighty-one", and thus it is an aban number.