42816961813 has 2 divisors, whose sum is σ = 42816961814. Its totient is φ = 42816961812.

The previous prime is 42816961741. The next prime is 42816961829. The reversal of 42816961813 is 31816961824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25479182884 + 17337778929 = 159622^2 + 131673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42816961813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42816961013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21408480906 + 21408480907.

It is an arithmetic number, because the mean of its divisors is an integer number (21408480907).

Almost surely, 2^42816961813 is an apocalyptic number.

It is an amenable number.

42816961813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42816961813 is an equidigital number, since it uses as much as digits as its factorization.

42816961813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The spelling of 42816961813 in words is "forty-two billion, eight hundred sixteen million, nine hundred sixty-one thousand, eight hundred thirteen".