16656299777 has 8 divisors (see below), whose sum is σ = 17943479400. Its totient is φ = 15369966720.

The previous prime is 16656299753. The next prime is 16656299791. The reversal of 16656299777 is 77799265661.

16656299777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1367224576 + 15289075201 = 36976^2 + 123649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16656299777 - 2⁶ = 16656299713 is a prime.

It is a super-2 number, since 2×16656299777² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16656799777) 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 in 7 ways as a sum of consecutive naturals, for example, 170474 + ... + 249747.

It is an arithmetic number, because the mean of its divisors is an integer number (2242934925).

Almost surely, 2^16656299777 is an apocalyptic number.

It is an amenable number.

16656299777 is a deficient number, since it is larger than the sum of its proper divisors (1287179623).

16656299777 is a wasteful number, since it uses less digits than its factorization.

16656299777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423283.

The product of its digits is 60011280, while the sum is 65.

The spelling of 16656299777 in words is "sixteen billion, six hundred fifty-six million, two hundred ninety-nine thousand, seven hundred seventy-seven".