1601506605 has 8 divisors (see below), whose sum is σ = 2562410592. Its totient is φ = 854136848.

The previous prime is 1601506591. The next prime is 1601506609. The reversal of 1601506605 is 5066051061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1601506605 - 2⁷ = 1601506477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601506609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53383539 + ... + 53383568.

It is an arithmetic number, because the mean of its divisors is an integer number (320301324).

Almost surely, 2^1601506605 is an apocalyptic number.

1601506605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1601506605 is a deficient number, since it is larger than the sum of its proper divisors (960903987).

1601506605 is a wasteful number, since it uses less digits than its factorization.

1601506605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106767115.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1601506605 is about 40018.8281312684. The cubic root of 1601506605 is about 1169.9740917632.

Adding to 1601506605 its reverse (5066051061), we get a palindrome (6667557666).

The spelling of 1601506605 in words is "one billion, six hundred one million, five hundred six thousand, six hundred five".