16551079801 has 9 divisors (see below), whose sum is σ = 16698914031. Its totient is φ = 16404546312.

The previous prime is 16551079789. The next prime is 16551079813. The reversal of 16551079801 is 10897015561.

The square root of 16551079801 is 128651.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (16551079789) and next prime (16551079813).

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 16518418576 = 5715^2 + 128524^2 .

It is not a de Polignac number, because 16551079801 - 2¹³ = 16551071609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16551079001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16338171 + ... + 16339183.

Almost surely, 2^16551079801 is an apocalyptic number.

16551079801 is the 128651-st square number.

16551079801 is the 64326-th centered octagonal number.

It is an amenable number.

16551079801 is a deficient number, since it is larger than the sum of its proper divisors (147834230).

16551079801 is an frugal number, since it uses more digits than its factorization.

16551079801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 43.

The spelling of 16551079801 in words is "sixteen billion, five hundred fifty-one million, seventy-nine thousand, eight hundred one".