42815693161 has 2 divisors, whose sum is σ = 42815693162. Its totient is φ = 42815693160.

The previous prime is 42815693117. The next prime is 42815693191. The reversal of 42815693161 is 16139651824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22092363225 + 20723329936 = 148635^2 + 143956^2 .

It is a cyclic number.

It is not a de Polignac number, because 42815693161 - 2¹⁹ = 42815168873 is a prime.

It is not a weakly prime, because it can be changed into another prime (42815693191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21407846580 + 21407846581.

It is an arithmetic number, because the mean of its divisors is an integer number (21407846581).

Almost surely, 2^42815693161 is an apocalyptic number.

It is an amenable number.

42815693161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42815693161 is an equidigital number, since it uses as much as digits as its factorization.

42815693161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The spelling of 42815693161 in words is "forty-two billion, eight hundred fifteen million, six hundred ninety-three thousand, one hundred sixty-one".