168921238430969 has 2 divisors, whose sum is σ = 168921238430970. Its totient is φ = 168921238430968.

The previous prime is 168921238430951. The next prime is 168921238430993. The reversal of 168921238430969 is 969034832129861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159521648915344 + 9399589515625 = 12630188^2 + 3065875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168921238430969 is a prime.

It is a super-2 number, since 2×168921238430969² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168921238430929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84460619215484 + 84460619215485.

It is an arithmetic number, because the mean of its divisors is an integer number (84460619215485).

Almost surely, 2^{168921238430969} is an apocalyptic number.

It is an amenable number.

168921238430969 is a deficient number, since it is larger than the sum of its proper divisors (1).

168921238430969 is an equidigital number, since it uses as much as digits as its factorization.

168921238430969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241864704, while the sum is 71.

The spelling of 168921238430969 in words is "one hundred sixty-eight trillion, nine hundred twenty-one billion, two hundred thirty-eight million, four hundred thirty thousand, nine hundred sixty-nine".