169601920369 has 12 divisors (see below), whose sum is σ = 197305662564. Its totient is φ = 145363029504.

The previous prime is 169601920363. The next prime is 169601920379. The reversal of 169601920369 is 963029106961.

It can be written as a sum of positive squares in 2 ways, for example, as 80193744225 + 89408176144 = 283185^2 + 299012^2 .

It is not a de Polignac number, because 169601920369 - 2⁵ = 169601920337 is a prime.

It is a super-2 number, since 2×169601920369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169601920363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646329 + ... + 870025.

It is an arithmetic number, because the mean of its divisors is an integer number (16442138547).

Almost surely, 2^169601920369 is an apocalyptic number.

It is an amenable number.

169601920369 is a deficient number, since it is larger than the sum of its proper divisors (27703742195).

169601920369 is a wasteful number, since it uses less digits than its factorization.

169601920369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239184 (or 239177 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 52.

The spelling of 169601920369 in words is "one hundred sixty-nine billion, six hundred one million, nine hundred twenty thousand, three hundred sixty-nine".