168507763531 has 2 divisors, whose sum is σ = 168507763532. Its totient is φ = 168507763530.

The previous prime is 168507763513. The next prime is 168507763607. The reversal of 168507763531 is 135367705861.

Together with previous prime (168507763513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168507763531 - 2¹¹ = 168507761483 is a prime.

It is a super-2 number, since 2×168507763531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168507763231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84253881765 + 84253881766.

It is an arithmetic number, because the mean of its divisors is an integer number (84253881766).

Almost surely, 2^168507763531 is an apocalyptic number.

168507763531 is a deficient number, since it is larger than the sum of its proper divisors (1).

168507763531 is an equidigital number, since it uses as much as digits as its factorization.

168507763531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 168507763531 in words is "one hundred sixty-eight billion, five hundred seven million, seven hundred sixty-three thousand, five hundred thirty-one".