42424666657 has 2 divisors, whose sum is σ = 42424666658. Its totient is φ = 42424666656.

The previous prime is 42424666643. The next prime is 42424666709. The reversal of 42424666657 is 75666642424.

It is an a-pointer prime, because the next prime (42424666709) can be obtained adding 42424666657 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38496009616 + 3928657041 = 196204^2 + 62679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42424666657 is a prime.

It is not a weakly prime, because it can be changed into another prime (42424666957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21212333328 + 21212333329.

It is an arithmetic number, because the mean of its divisors is an integer number (21212333329).

Almost surely, 2^42424666657 is an apocalyptic number.

It is an amenable number.

42424666657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42424666657 is an equidigital number, since it uses as much as digits as its factorization.

42424666657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 52.

The spelling of 42424666657 in words is "forty-two billion, four hundred twenty-four million, six hundred sixty-six thousand, six hundred fifty-seven".