169491642660 has 36 divisors (see below), whose sum is σ = 514124649948. Its totient is φ = 45197771328.

The previous prime is 169491642653. The next prime is 169491642673. The reversal of 169491642660 is 66246194961.

169491642660 is a `hidden beast` number, since 16 + 9 + 491 + 64 + 26 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63283439844 + 106208202816 = 251562^2 + 325896^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 169491642597 and 169491642606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 470809939 + ... + 470810298.

Almost surely, 2^169491642660 is an apocalyptic number.

169491642660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169491642660 is an abundant number, since it is smaller than the sum of its proper divisors (344633007288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

169491642660 is a wasteful number, since it uses less digits than its factorization.

169491642660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941620252 (or 941620247 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 169491642660 in words is "one hundred sixty-nine billion, four hundred ninety-one million, six hundred forty-two thousand, six hundred sixty".