42506210557 has 2 divisors, whose sum is σ = 42506210558. Its totient is φ = 42506210556.

The previous prime is 42506210521. The next prime is 42506210597. The reversal of 42506210557 is 75501260524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39653155161 + 2853055396 = 199131^2 + 53414^2 .

It is a cyclic number.

It is not a de Polignac number, because 42506210557 - 2⁷ = 42506210429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42506210597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21253105278 + 21253105279.

It is an arithmetic number, because the mean of its divisors is an integer number (21253105279).

Almost surely, 2^42506210557 is an apocalyptic number.

It is an amenable number.

42506210557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42506210557 is an equidigital number, since it uses as much as digits as its factorization.

42506210557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 42506210557 in words is "forty-two billion, five hundred six million, two hundred ten thousand, five hundred fifty-seven".