16400289617 has 2 divisors, whose sum is σ = 16400289618. Its totient is φ = 16400289616.

The previous prime is 16400289533. The next prime is 16400289667. The reversal of 16400289617 is 71698200461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14788748881 + 1611540736 = 121609^2 + 40144^2 .

It is an emirp because it is prime and its reverse (71698200461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16400289617 - 2¹⁴ = 16400273233 is a prime.

It is not a weakly prime, because it can be changed into another prime (16400289667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200144808 + 8200144809.

It is an arithmetic number, because the mean of its divisors is an integer number (8200144809).

Almost surely, 2^16400289617 is an apocalyptic number.

It is an amenable number.

16400289617 is a deficient number, since it is larger than the sum of its proper divisors (1).

16400289617 is an equidigital number, since it uses as much as digits as its factorization.

16400289617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 16400289617 in words is "sixteen billion, four hundred million, two hundred eighty-nine thousand, six hundred seventeen".