42145243709 has 2 divisors, whose sum is σ = 42145243710. Its totient is φ = 42145243708.

The previous prime is 42145243639. The next prime is 42145243727. The reversal of 42145243709 is 90734254124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28267696900 + 13877546809 = 168130^2 + 117803^2 .

It is a cyclic number.

It is not a de Polignac number, because 42145243709 - 2³² = 37850276413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42145243729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21072621854 + 21072621855.

It is an arithmetic number, because the mean of its divisors is an integer number (21072621855).

Almost surely, 2^42145243709 is an apocalyptic number.

It is an amenable number.

42145243709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42145243709 is an equidigital number, since it uses as much as digits as its factorization.

42145243709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 42145243709 in words is "forty-two billion, one hundred forty-five million, two hundred forty-three thousand, seven hundred nine".