42775457381 has 2 divisors, whose sum is σ = 42775457382. Its totient is φ = 42775457380.

The previous prime is 42775457369. The next prime is 42775457419. The reversal of 42775457381 is 18375457724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35169001156 + 7606456225 = 187534^2 + 87215^2 .

It is a cyclic number.

It is not a de Polignac number, because 42775457381 - 2¹⁰ = 42775456357 is a prime.

It is a super-2 number, since 2×42775457381² (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 (42775457281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21387728690 + 21387728691.

It is an arithmetic number, because the mean of its divisors is an integer number (21387728691).

Almost surely, 2^42775457381 is an apocalyptic number.

It is an amenable number.

42775457381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42775457381 is an equidigital number, since it uses as much as digits as its factorization.

42775457381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6585600, while the sum is 53.

The spelling of 42775457381 in words is "forty-two billion, seven hundred seventy-five million, four hundred fifty-seven thousand, three hundred eighty-one".