42017521757 has 2 divisors, whose sum is σ = 42017521758. Its totient is φ = 42017521756.

The previous prime is 42017521673. The next prime is 42017521783. The reversal of 42017521757 is 75712571024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34886394841 + 7131126916 = 186779^2 + 84446^2 .

It is a cyclic number.

It is not a de Polignac number, because 42017521757 - 2⁸ = 42017521501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42017521057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21008760878 + 21008760879.

It is an arithmetic number, because the mean of its divisors is an integer number (21008760879).

Almost surely, 2^42017521757 is an apocalyptic number.

It is an amenable number.

42017521757 is a deficient number, since it is larger than the sum of its proper divisors (1).

42017521757 is an equidigital number, since it uses as much as digits as its factorization.

42017521757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137200, while the sum is 41.

The spelling of 42017521757 in words is "forty-two billion, seventeen million, five hundred twenty-one thousand, seven hundred fifty-seven".