42656916557 has 2 divisors, whose sum is σ = 42656916558. Its totient is φ = 42656916556.

The previous prime is 42656916541. The next prime is 42656916571. The reversal of 42656916557 is 75561965624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42471439396 + 185477161 = 206086^2 + 13619^2 .

It is a cyclic number.

It is not a de Polignac number, because 42656916557 - 2⁴ = 42656916541 is a prime.

It is a super-2 number, since 2×42656916557² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42656916517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21328458278 + 21328458279.

It is an arithmetic number, because the mean of its divisors is an integer number (21328458279).

Almost surely, 2^42656916557 is an apocalyptic number.

It is an amenable number.

42656916557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42656916557 is an equidigital number, since it uses as much as digits as its factorization.

42656916557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608000, while the sum is 56.

The spelling of 42656916557 in words is "forty-two billion, six hundred fifty-six million, nine hundred sixteen thousand, five hundred fifty-seven".