16516691405 has 8 divisors (see below), whose sum is σ = 20355706392. Its totient is φ = 12856235328.

The previous prime is 16516691369. The next prime is 16516691419. The reversal of 16516691405 is 50419661561.

It can be written as a sum of positive squares in 4 ways, for example, as 4491814441 + 12024876964 = 67021^2 + 109658^2 .

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 16516691405 - 2¹⁶ = 16516625869 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 7 ways as a sum of consecutive naturals, for example, 44639522 + ... + 44639891.

It is an arithmetic number, because the mean of its divisors is an integer number (2544463299).

Almost surely, 2^16516691405 is an apocalyptic number.

It is an amenable number.

16516691405 is a deficient number, since it is larger than the sum of its proper divisors (3839014987).

16516691405 is an equidigital number, since it uses as much as digits as its factorization.

16516691405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89279455.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 16516691405 in words is "sixteen billion, five hundred sixteen million, six hundred ninety-one thousand, four hundred five".