1605665334 has 64 divisors (see below), whose sum is σ = 4184925696. Its totient is φ = 398559744.

The previous prime is 1605665293. The next prime is 1605665389. The reversal of 1605665334 is 4335665061.

It is a happy number.

1605665334 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1605665334² = 5156322329618663112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1605665292 and 1605665301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77212 + ... + 95775.

It is an arithmetic number, because the mean of its divisors is an integer number (65389464).

Almost surely, 2^1605665334 is an apocalyptic number.

1605665334 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1605665334 is an abundant number, since it is smaller than the sum of its proper divisors (2579260362).

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

1605665334 is a wasteful number, since it uses less digits than its factorization.

1605665334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173029.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 1605665334 is about 40070.7540982198. The cubic root of 1605665334 is about 1170.9859305803.

The spelling of 1605665334 in words is "one billion, six hundred five million, six hundred sixty-five thousand, three hundred thirty-four".