1601516605 has 8 divisors (see below), whose sum is σ = 2069652312. Its totient is φ = 1182658368.

The previous prime is 1601516599. The next prime is 1601516627. The reversal of 1601516605 is 5066151061.

It can be written as a sum of positive squares in 4 ways, for example, as 1996569 + 1599520036 = 1413^2 + 39994^2 .

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 1601516605 - 2²¹ = 1599419453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12319294 + ... + 12319423.

It is an arithmetic number, because the mean of its divisors is an integer number (258706539).

Almost surely, 2^1601516605 is an apocalyptic number.

It is an amenable number.

1601516605 is a deficient number, since it is larger than the sum of its proper divisors (468135707).

1601516605 is a wasteful number, since it uses less digits than its factorization.

1601516605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24638735.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1601516605 is about 40018.9530722631. The cubic root of 1601516605 is about 1169.9765269112.

Adding to 1601516605 its reverse (5066151061), we get a palindrome (6667667666).

The spelling of 1601516605 in words is "one billion, six hundred one million, five hundred sixteen thousand, six hundred five".