42505383913 has 2 divisors, whose sum is σ = 42505383914. Its totient is φ = 42505383912.

The previous prime is 42505383859. The next prime is 42505383961. The reversal of 42505383913 is 31938350524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42190392409 + 314991504 = 205403^2 + 17748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42505383913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42505383913.

It is not a weakly prime, because it can be changed into another prime (42505303913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21252691956 + 21252691957.

It is an arithmetic number, because the mean of its divisors is an integer number (21252691957).

Almost surely, 2^42505383913 is an apocalyptic number.

It is an amenable number.

42505383913 is a deficient number, since it is larger than the sum of its proper divisors (1).

42505383913 is an equidigital number, since it uses as much as digits as its factorization.

42505383913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 42505383913 in words is "forty-two billion, five hundred five million, three hundred eighty-three thousand, nine hundred thirteen".