16444121563 has 2 divisors, whose sum is σ = 16444121564. Its totient is φ = 16444121562.

The previous prime is 16444121549. The next prime is 16444121593. The reversal of 16444121563 is 36512144461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16444121563 - 2¹⁷ = 16443990491 is a prime.

It is a super-3 number, since 3×16444121563³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16444121513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8222060781 + 8222060782.

It is an arithmetic number, because the mean of its divisors is an integer number (8222060782).

Almost surely, 2^16444121563 is an apocalyptic number.

16444121563 is a deficient number, since it is larger than the sum of its proper divisors (1).

16444121563 is an equidigital number, since it uses as much as digits as its factorization.

16444121563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 37.

The spelling of 16444121563 in words is "sixteen billion, four hundred forty-four million, one hundred twenty-one thousand, five hundred sixty-three".