521340042163 has 2 divisors, whose sum is σ = 521340042164. Its totient is φ = 521340042162.

The previous prime is 521340042107. The next prime is 521340042169. The reversal of 521340042163 is 361240043125.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521340042163 is a prime.

It is not a weakly prime, because it can be changed into another prime (521340042169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260670021081 + 260670021082.

It is an arithmetic number, because the mean of its divisors is an integer number (260670021082).

Almost surely, 2^521340042163 is an apocalyptic number.

521340042163 is a deficient number, since it is larger than the sum of its proper divisors (1).

521340042163 is an equidigital number, since it uses as much as digits as its factorization.

521340042163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 521340042163 its reverse (361240043125), we get a palindrome (882580085288).

The spelling of 521340042163 in words is "five hundred twenty-one billion, three hundred forty million, forty-two thousand, one hundred sixty-three".