16408961641 has 4 divisors (see below), whose sum is σ = 16578126292. Its totient is φ = 16239796992.

The previous prime is 16408961617. The next prime is 16408961651. The reversal of 16408961641 is 14616980461.

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 6332817241 + 10076144400 = 79579^2 + 100380^2 .

It is a cyclic number.

It is not a de Polignac number, because 16408961641 - 2²⁷ = 16274743913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16408961591 and 16408961600.

It is not an unprimeable number, because it can be changed into a prime (16408961651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84582180 + ... + 84582373.

It is an arithmetic number, because the mean of its divisors is an integer number (4144531573).

Almost surely, 2^16408961641 is an apocalyptic number.

It is an amenable number.

16408961641 is a deficient number, since it is larger than the sum of its proper divisors (169164651).

16408961641 is an equidigital number, since it uses as much as digits as its factorization.

16408961641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169164650.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 16408961641 in words is "sixteen billion, four hundred eight million, nine hundred sixty-one thousand, six hundred forty-one".