42718773509 has 2 divisors, whose sum is σ = 42718773510. Its totient is φ = 42718773508.

The previous prime is 42718773467. The next prime is 42718773541. The reversal of 42718773509 is 90537781724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28823550625 + 13895222884 = 169775^2 + 117878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42718773509 is a prime.

It is a super-2 number, since 2×42718773509² (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 (42718773569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21359386754 + 21359386755.

It is an arithmetic number, because the mean of its divisors is an integer number (21359386755).

Almost surely, 2^42718773509 is an apocalyptic number.

It is an amenable number.

42718773509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42718773509 is an equidigital number, since it uses as much as digits as its factorization.

42718773509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 42718773509 in words is "forty-two billion, seven hundred eighteen million, seven hundred seventy-three thousand, five hundred nine".