1601606720505 has 16 divisors (see below), whose sum is σ = 2795531730624. Its totient is φ = 776536591680.

The previous prime is 1601606720503. The next prime is 1601606720537. The reversal of 1601606720505 is 5050276061061.

It is not a de Polignac number, because 1601606720505 - 2¹ = 1601606720503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1601606720503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4853353534 + ... + 4853353863.

It is an arithmetic number, because the mean of its divisors is an integer number (174720733164).

Almost surely, 2^{1601606720505} is an apocalyptic number.

1601606720505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1601606720505 is a deficient number, since it is larger than the sum of its proper divisors (1193925010119).

1601606720505 is a wasteful number, since it uses less digits than its factorization.

1601606720505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9706707416.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 1601606720505 in words is "one trillion, six hundred one billion, six hundred six million, seven hundred twenty thousand, five hundred five".