1609965645 has 16 divisors (see below), whose sum is σ = 2645566080. Its totient is φ = 835441344.

The previous prime is 1609965641. The next prime is 1609965667. The reversal of 1609965645 is 5465699061.

It is not a de Polignac number, because 1609965645 - 2² = 1609965641 is a prime.

It is a super-3 number, since 3×1609965645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609965641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1449865 + ... + 1450974.

It is an arithmetic number, because the mean of its divisors is an integer number (165347880).

Almost surely, 2^1609965645 is an apocalyptic number.

1609965645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1609965645 is a deficient number, since it is larger than the sum of its proper divisors (1035600435).

1609965645 is a wasteful number, since it uses less digits than its factorization.

1609965645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900884.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 1609965645 is about 40124.3771914282. The cubic root of 1609965645 is about 1172.0303812883.

The spelling of 1609965645 in words is "one billion, six hundred nine million, nine hundred sixty-five thousand, six hundred forty-five".