16645170431 has 2 divisors, whose sum is σ = 16645170432. Its totient is φ = 16645170430.

The previous prime is 16645170379. The next prime is 16645170439. The reversal of 16645170431 is 13407154661.

It is a happy number.

16645170431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16645170431 - 2¹⁰ = 16645169407 is a prime.

It is a super-2 number, since 2×16645170431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16645170439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322585215 + 8322585216.

It is an arithmetic number, because the mean of its divisors is an integer number (8322585216).

Almost surely, 2^16645170431 is an apocalyptic number.

16645170431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16645170431 is an equidigital number, since it uses as much as digits as its factorization.

16645170431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 16645170431 in words is "sixteen billion, six hundred forty-five million, one hundred seventy thousand, four hundred thirty-one".