1605213603 has 12 divisors (see below), whose sum is σ = 2649876528. Its totient is φ = 917264880.

The previous prime is 1605213529. The next prime is 1605213611. The reversal of 1605213603 is 3063125061.

1605213603 is a `hidden beast` number, since 1 + 6 + 0 + 52 + 1 + 3 + 603 = 666.

It is not a de Polignac number, because 1605213603 - 2¹⁰ = 1605212579 is a prime.

It is a super-2 number, since 2×1605213603² = 5153421422512483218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1605215603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12739728 + ... + 12739853.

It is an arithmetic number, because the mean of its divisors is an integer number (220823044).

Almost surely, 2^1605213603 is an apocalyptic number.

1605213603 is a deficient number, since it is larger than the sum of its proper divisors (1044662925).

1605213603 is a wasteful number, since it uses less digits than its factorization.

1605213603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25479594 (or 25479591 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1605213603 is about 40065.1170346475. The cubic root of 1605213603 is about 1170.8761068937.

Adding to 1605213603 its reverse (3063125061), we get a palindrome (4668338664).

The spelling of 1605213603 in words is "one billion, six hundred five million, two hundred thirteen thousand, six hundred three".