42774251881 has 2 divisors, whose sum is σ = 42774251882. Its totient is φ = 42774251880.

The previous prime is 42774251869. The next prime is 42774251959. The reversal of 42774251881 is 18815247724.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37913931225 + 4860320656 = 194715^2 + 69716^2 .

It is a cyclic number.

It is not a de Polignac number, because 42774251881 - 2⁹ = 42774251369 is a prime.

It is a super-2 number, since 2×42774251881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42774251801) 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, 21387125940 + 21387125941.

It is an arithmetic number, because the mean of its divisors is an integer number (21387125941).

Almost surely, 2^42774251881 is an apocalyptic number.

It is an amenable number.

42774251881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42774251881 is an equidigital number, since it uses as much as digits as its factorization.

42774251881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1003520, while the sum is 49.

The spelling of 42774251881 in words is "forty-two billion, seven hundred seventy-four million, two hundred fifty-one thousand, eight hundred eighty-one".