42780125693 has 2 divisors, whose sum is σ = 42780125694. Its totient is φ = 42780125692.

The previous prime is 42780125627. The next prime is 42780125747. The reversal of 42780125693 is 39652108724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41886534244 + 893591449 = 204662^2 + 29893^2 .

It is a cyclic number.

It is not a de Polignac number, because 42780125693 - 2¹⁰ = 42780124669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42780125623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21390062846 + 21390062847.

It is an arithmetic number, because the mean of its divisors is an integer number (21390062847).

It is a 1-persistent number, because it is pandigital, but 2⋅42780125693 = 85560251386 is not.

Almost surely, 2^42780125693 is an apocalyptic number.

It is an amenable number.

42780125693 is a deficient number, since it is larger than the sum of its proper divisors (1).

42780125693 is an equidigital number, since it uses as much as digits as its factorization.

42780125693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 42780125693 in words is "forty-two billion, seven hundred eighty million, one hundred twenty-five thousand, six hundred ninety-three".