169651385240545 has 32 divisors (see below), whose sum is σ = 222970408043040. Its totient is φ = 123152863242240.

The previous prime is 169651385240543. The next prime is 169651385240551. The reversal of 169651385240545 is 545042583156961.

It can be written as a sum of positive squares in 16 ways, for example, as 93609340236864 + 76042045003681 = 9675192^2 + 8720209^2 .

It is not a de Polignac number, because 169651385240545 - 2¹ = 169651385240543 is a prime.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (169651385240543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6341050 + ... + 19481059.

It is an arithmetic number, because the mean of its divisors is an integer number (6967825251345).

Almost surely, 2^{169651385240545} is an apocalyptic number.

It is an amenable number.

169651385240545 is a deficient number, since it is larger than the sum of its proper divisors (53319022802495).

169651385240545 is a wasteful number, since it uses less digits than its factorization.

169651385240545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25823845.

The product of its (nonzero) digits is 155520000, while the sum is 64.

The spelling of 169651385240545 in words is "one hundred sixty-nine trillion, six hundred fifty-one billion, three hundred eighty-five million, two hundred forty thousand, five hundred forty-five".