1669604481 has 20 divisors (see below), whose sum is σ = 2503138132. Its totient is φ = 1109036448.

The previous prime is 1669604471. The next prime is 1669604509. The reversal of 1669604481 is 1844069661.

1669604481 is a `hidden beast` number, since 166 + 9 + 6 + 0 + 4 + 481 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 557715456 + 1111889025 = 23616^2 + 33345^2 .

It is not a de Polignac number, because 1669604481 - 2²³ = 1661215873 is a prime.

It is a super-2 number, since 2×1669604481² = 5575158245950558722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669604401) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14770 + ... + 59643.

Almost surely, 2^1669604481 is an apocalyptic number.

It is an amenable number.

1669604481 is a deficient number, since it is larger than the sum of its proper divisors (833533651).

1669604481 is an equidigital number, since it uses as much as digits as its factorization.

1669604481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74702 (or 74693 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1669604481 is about 40860.7939350180. The cubic root of 1669604481 is about 1186.3273253903.

The spelling of 1669604481 in words is "one billion, six hundred sixty-nine million, six hundred four thousand, four hundred eighty-one".