169661648 has 20 divisors (see below), whose sum is σ = 354005988. Its totient is φ = 78305280.

The previous prime is 169661641. The next prime is 169661677. The reversal of 169661648 is 846166961.

It can be written as a sum of positive squares in 2 ways, for example, as 83320384 + 86341264 = 9128^2 + 9292^2 .

It is a super-4 number, since 4×169661648⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169661641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407633 + ... + 408048.

Almost surely, 2^169661648 is an apocalyptic number.

It is an amenable number.

169661648 is an abundant number, since it is smaller than the sum of its proper divisors (184344340).

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

169661648 is a wasteful number, since it uses less digits than its factorization.

169661648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815702 (or 815696 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 169661648 is about 13025.4231409195. The cubic root of 169661648 is about 553.5980610989.

The spelling of 169661648 in words is "one hundred sixty-nine million, six hundred sixty-one thousand, six hundred forty-eight".