42185786957 has 2 divisors, whose sum is σ = 42185786958. Its totient is φ = 42185786956.

The previous prime is 42185786939. The next prime is 42185786971. The reversal of 42185786957 is 75968758124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36032012041 + 6153774916 = 189821^2 + 78446^2 .

It is a cyclic number.

It is not a de Polignac number, because 42185786957 - 2⁶ = 42185786893 is a prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 42185786957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42185780957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21092893478 + 21092893479.

It is an arithmetic number, because the mean of its divisors is an integer number (21092893479).

Almost surely, 2^42185786957 is an apocalyptic number.

It is an amenable number.

42185786957 is a deficient number, since it is larger than the sum of its proper divisors (1).

42185786957 is an equidigital number, since it uses as much as digits as its factorization.

42185786957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33868800, while the sum is 62.

The spelling of 42185786957 in words is "forty-two billion, one hundred eighty-five million, seven hundred eighty-six thousand, nine hundred fifty-seven".