16111251605 has 4 divisors (see below), whose sum is σ = 19333501932. Its totient is φ = 12889001280.

The previous prime is 16111251581. The next prime is 16111251631. The reversal of 16111251605 is 50615211161.

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 9375274276 + 6735977329 = 96826^2 + 82073^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16111251605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611125156 + ... + 1611125165.

It is an arithmetic number, because the mean of its divisors is an integer number (4833375483).

Almost surely, 2^16111251605 is an apocalyptic number.

It is an amenable number.

16111251605 is a deficient number, since it is larger than the sum of its proper divisors (3222250327).

16111251605 is an equidigital number, since it uses as much as digits as its factorization.

16111251605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222250326.

The product of its (nonzero) digits is 1800, while the sum is 29.

Adding to 16111251605 its reverse (50615211161), we get a palindrome (66726462766).

The spelling of 16111251605 in words is "sixteen billion, one hundred eleven million, two hundred fifty-one thousand, six hundred five".