16651124641 has 4 divisors (see below), whose sum is σ = 16664586772. Its totient is φ = 16637662512.

The previous prime is 16651124629. The next prime is 16651124653. The reversal of 16651124641 is 14642115661.

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

It is an interprime number because it is at equal distance from previous prime (16651124629) and next prime (16651124653).

It can be written as a sum of positive squares in 2 ways, for example, as 8336420416 + 8314704225 = 91304^2 + 91185^2 .

It is a cyclic number.

It is not a de Polignac number, because 16651124641 - 2⁹ = 16651124129 is a prime.

It is a super-4 number, since 4×16651124641⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16651124641.

It is not an unprimeable number, because it can be changed into a prime (16651124671) 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, 6729210 + ... + 6731683.

It is an arithmetic number, because the mean of its divisors is an integer number (4166146693).

Almost surely, 2^16651124641 is an apocalyptic number.

It is an amenable number.

16651124641 is a deficient number, since it is larger than the sum of its proper divisors (13462131).

16651124641 is a wasteful number, since it uses less digits than its factorization.

16651124641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13462130.

The product of its digits is 34560, while the sum is 37.

The spelling of 16651124641 in words is "sixteen billion, six hundred fifty-one million, one hundred twenty-four thousand, six hundred forty-one".