16555507609 has 2 divisors, whose sum is σ = 16555507610. Its totient is φ = 16555507608.

The previous prime is 16555507603. The next prime is 16555507637. The reversal of 16555507609 is 90670555561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13558273600 + 2997234009 = 116440^2 + 54747^2 .

It is a cyclic number.

It is not a de Polignac number, because 16555507609 - 2¹³ = 16555499417 is a prime.

It is not a weakly prime, because it can be changed into another prime (16555507603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277753804 + 8277753805.

It is an arithmetic number, because the mean of its divisors is an integer number (8277753805).

Almost surely, 2^16555507609 is an apocalyptic number.

It is an amenable number.

16555507609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555507609 is an equidigital number, since it uses as much as digits as its factorization.

16555507609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417500, while the sum is 49.

The spelling of 16555507609 in words is "sixteen billion, five hundred fifty-five million, five hundred seven thousand, six hundred nine".