1609139664 has 60 divisors (see below), whose sum is σ = 4912756992. Its totient is φ = 487617600.

The previous prime is 1609139633. The next prime is 1609139677. The reversal of 1609139664 is 4669319061.

1609139664 is a `hidden beast` number, since 1 + 609 + 1 + 39 + 6 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 506352 + ... + 509519.

Almost surely, 2^1609139664 is an apocalyptic number.

It is an amenable number.

1609139664 is an abundant number, since it is smaller than the sum of its proper divisors (3303617328).

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

1609139664 is a wasteful number, since it uses less digits than its factorization.

1609139664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015896 (or 1015887 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 1609139664 is about 40114.0831130415. The cubic root of 1609139664 is about 1171.8299131539.

It can be divided in two parts, 16091 and 39664, that added together give a palindrome (55755).

The spelling of 1609139664 in words is "one billion, six hundred nine million, one hundred thirty-nine thousand, six hundred sixty-four".