1601601615 has 24 divisors (see below), whose sum is σ = 2809563120. Its totient is φ = 843894144.

The previous prime is 1601601613. The next prime is 1601601623. The reversal of 1601601615 is 5161061061.

It is not a de Polignac number, because 1601601615 - 2¹ = 1601601613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601601611) 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 23 ways as a sum of consecutive naturals, for example, 210670 + ... + 218139.

It is an arithmetic number, because the mean of its divisors is an integer number (117065130).

Almost surely, 2^1601601615 is an apocalyptic number.

1601601615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1601601615 is a deficient number, since it is larger than the sum of its proper divisors (1207961505).

1601601615 is a wasteful number, since it uses less digits than its factorization.

1601601615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428903 (or 428900 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1601601615 is about 40020.0151799072. The cubic root of 1601601615 is about 1169.9972276945.

Adding to 1601601615 its reverse (5161061061), we get a palindrome (6762662676).

The spelling of 1601601615 in words is "one billion, six hundred one million, six hundred one thousand, six hundred fifteen".