169868525259421 has 2 divisors, whose sum is σ = 169868525259422. Its totient is φ = 169868525259420.

The previous prime is 169868525259401. The next prime is 169868525259451. The reversal of 169868525259421 is 124952525868961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99784336402521 + 70084188856900 = 9989211^2 + 8371630^2 .

It is a cyclic number.

It is not a de Polignac number, because 169868525259421 - 2³⁹ = 169318769445533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169868525259401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84934262629710 + 84934262629711.

It is an arithmetic number, because the mean of its divisors is an integer number (84934262629711).

Almost surely, 2^{169868525259421} is an apocalyptic number.

It is an amenable number.

169868525259421 is a deficient number, since it is larger than the sum of its proper divisors (1).

169868525259421 is an equidigital number, since it uses as much as digits as its factorization.

169868525259421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496000, while the sum is 73.

The spelling of 169868525259421 in words is "one hundred sixty-nine trillion, eight hundred sixty-eight billion, five hundred twenty-five million, two hundred fifty-nine thousand, four hundred twenty-one".