16645576973 has 2 divisors, whose sum is σ = 16645576974. Its totient is φ = 16645576972.

The previous prime is 16645576939. The next prime is 16645577017. The reversal of 16645576973 is 37967554661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10534559044 + 6111017929 = 102638^2 + 78173^2 .

It is a cyclic number.

It is not a de Polignac number, because 16645576973 - 2²² = 16641382669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16645516973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322788486 + 8322788487.

It is an arithmetic number, because the mean of its divisors is an integer number (8322788487).

Almost surely, 2^16645576973 is an apocalyptic number.

It is an amenable number.

16645576973 is a deficient number, since it is larger than the sum of its proper divisors (1).

16645576973 is an equidigital number, since it uses as much as digits as its factorization.

16645576973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28576800, while the sum is 59.

The spelling of 16645576973 in words is "sixteen billion, six hundred forty-five million, five hundred seventy-six thousand, nine hundred seventy-three".