16001511605 has 4 divisors (see below), whose sum is σ = 19201813932. Its totient is φ = 12801209280.

The previous prime is 16001511593. The next prime is 16001511607. The reversal of 16001511605 is 50611510061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1836465316 + 14165046289 = 42854^2 + 119017^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16001511605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001511607) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1600151156 + ... + 1600151165.

It is an arithmetic number, because the mean of its divisors is an integer number (4800453483).

Almost surely, 2^16001511605 is an apocalyptic number.

It is an amenable number.

16001511605 is a deficient number, since it is larger than the sum of its proper divisors (3200302327).

16001511605 is an equidigital number, since it uses as much as digits as its factorization.

16001511605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200302326.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 16001511605 in words is "sixteen billion, one million, five hundred eleven thousand, six hundred five".