16644416041601 has 4 divisors (see below), whose sum is σ = 16661628468672. Its totient is φ = 16627203614532.

The previous prime is 16644416041579. The next prime is 16644416041609. The reversal of 16644416041601 is 10614061444661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16644416041601 is a prime.

It is a super-3 number, since 3×16644416041601³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16644416041609) 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, 8606212085 + ... + 8606214018.

It is an arithmetic number, because the mean of its divisors is an integer number (4165407117168).

Almost surely, 2^{16644416041601} is an apocalyptic number.

It is an amenable number.

16644416041601 is a deficient number, since it is larger than the sum of its proper divisors (17212427071).

16644416041601 is an equidigital number, since it uses as much as digits as its factorization.

16644416041601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17212427070.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 16644416041601 in words is "sixteen trillion, six hundred forty-four billion, four hundred sixteen million, forty-one thousand, six hundred one".