16551772117 has 2 divisors, whose sum is σ = 16551772118. Its totient is φ = 16551772116.

The previous prime is 16551772091. The next prime is 16551772183. The reversal of 16551772117 is 71127715561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11288850001 + 5262922116 = 106249^2 + 72546^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551772117 - 2¹⁹ = 16551247829 is a prime.

It is a super-2 number, since 2×16551772117² (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 (16551775117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275886058 + 8275886059.

It is an arithmetic number, because the mean of its divisors is an integer number (8275886059).

Almost surely, 2^16551772117 is an apocalyptic number.

It is an amenable number.

16551772117 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551772117 is an equidigital number, since it uses as much as digits as its factorization.

16551772117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102900, while the sum is 43.

The spelling of 16551772117 in words is "sixteen billion, five hundred fifty-one million, seven hundred seventy-two thousand, one hundred seventeen".