42686371757 has 2 divisors, whose sum is σ = 42686371758. Its totient is φ = 42686371756.

The previous prime is 42686371733. The next prime is 42686371789. The reversal of 42686371757 is 75717368624.

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., 31223243401 + 11463128356 = 176701^2 + 107066^2 .

It is a cyclic number.

It is not a de Polignac number, because 42686371757 - 2¹⁰ = 42686370733 is a prime.

It is a super-3 number, since 3×42686371757³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42686371727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21343185878 + 21343185879.

It is an arithmetic number, because the mean of its divisors is an integer number (21343185879).

Almost surely, 2^42686371757 is an apocalyptic number.

It is an amenable number.

42686371757 is a deficient number, since it is larger than the sum of its proper divisors (1).

42686371757 is an equidigital number, since it uses as much as digits as its factorization.

42686371757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 56.

The spelling of 42686371757 in words is "forty-two billion, six hundred eighty-six million, three hundred seventy-one thousand, seven hundred fifty-seven".