42537073561 has 2 divisors, whose sum is σ = 42537073562. Its totient is φ = 42537073560.

The previous prime is 42537073511. The next prime is 42537073597. The reversal of 42537073561 is 16537073524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21710254336 + 20826819225 = 147344^2 + 144315^2 .

It is a cyclic number.

It is not a de Polignac number, because 42537073561 - 2⁷ = 42537073433 is a prime.

It is not a weakly prime, because it can be changed into another prime (42537073511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21268536780 + 21268536781.

It is an arithmetic number, because the mean of its divisors is an integer number (21268536781).

Almost surely, 2^42537073561 is an apocalyptic number.

It is an amenable number.

42537073561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42537073561 is an equidigital number, since it uses as much as digits as its factorization.

42537073561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 42537073561 in words is "forty-two billion, five hundred thirty-seven million, seventy-three thousand, five hundred sixty-one".