42945037081 has 2 divisors, whose sum is σ = 42945037082. Its totient is φ = 42945037080.

The previous prime is 42945037019. The next prime is 42945037111. The reversal of 42945037081 is 18073054924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25038315225 + 17906721856 = 158235^2 + 133816^2 .

It is a cyclic number.

It is not a de Polignac number, because 42945037081 - 2²¹ = 42942939929 is a prime.

It is a super-2 number, since 2×42945037081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42945037481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21472518540 + 21472518541.

It is an arithmetic number, because the mean of its divisors is an integer number (21472518541).

Almost surely, 2^42945037081 is an apocalyptic number.

It is an amenable number.

42945037081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42945037081 is an equidigital number, since it uses as much as digits as its factorization.

42945037081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 42945037081 in words is "forty-two billion, nine hundred forty-five million, thirty-seven thousand, eighty-one".